identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
EF7B8639FFD2FFB2FE410313FBC524CB.text	EF7B8639FFD2FFB2FE410313FBC524CB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Boreomysis (Boreomysis) sibogae Hansen 1910	<div><p>Boreomysis (Boreomysis) sibogae Hansen, 1910</p><p>Boreomysis sibogae Hansen, 1910: 25–26, pl. ii figs 3a–e.</p><p>Material examined (non-types)</p><p>SOUTHERN OCEAN • 1 juv. (BL = 8.5 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.1745&amp;materialsCitation.latitude=-58.7415" title="Search Plazi for locations around (long -25.1745/lat -58.7415)">South Sandwich Trench</a>, SE of Montagu Island, ANDEEP-II station 143-1; 58°44.69ʹ S, 25°10.27ʹ W to 58°44.49ʹ S, 25°10.47ʹ W; depth 773.9– 755.6 m; 25 Mar. 2002; EBS supranet • 1 ♀ imm. (BL = 11.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS epinet • 1 ♀ subad. (BL = 33.8 mm); same collection data as for preceding except for occurrence in supranet .</p><p>Type locality and distribution</p><p>Type locality by monotypy is station 185 of the Siboga Expedition, N Banda Sea, 3°20ʹ S, 127°22.9ʹ E; the types were taken with a non-closing net at depths of 1536–0 m (Hansen 1910). This species is panoceanic (including the Southern Ocean), mainly meso- and bathypelagic in depths of 50–4197 m. The ANDEEP records are within previously known distribution ranges.</p></div>	https://treatment.plazi.org/id/EF7B8639FFD2FFB2FE410313FBC524CB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFD3FFB5FE670710FB04241E.text	EF7B8639FFD3FFB5FE670710FB04241E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Neobirsteiniamysis inermis (Willemoes-Suhm 1874)	<div><p>Neobirsteiniamysis inermis (Willemoes-Suhm, 1874)</p><p>Petalophthalmus inermis Willemoes-Suhm, 1874: xv.</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 ♀ ad. (BL = 72.9 mm); NE Weddell Abyssal Plain, near fracture zone, ANDEEP-II station 137-4; 63°44.99ʹ S, 33°47.74ʹ W to 63°44.78ʹ S, 33°47.81ʹ W; depth 4975.7– 4975.1 m; 14 Mar. 2002; EBS supranet • 1 ♀ imm. (BL = 28.5 mm); NE Weddell Sea, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-27.909&amp;materialsCitation.latitude=-62.968166" title="Search Plazi for locations around (long -27.909/lat -62.968166)">Kosminski Fracture Zone deep</a>, ANDEEP-II station 138-6; 62°58.09ʹ S, 27°54.54ʹ W to 62°58.02ʹ S, 27°54.25ʹ W; depth 4542.5– 4541.1 m; 17 Mar. 2002; EBS supranet • 1 ♂ ad. (BL = 57.8 mm), 1 ♀ subad. (BL = 52.4 mm); eastern Weddell Abyssal Plain, S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet • 1 imm. (BL = 13.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-13.980166&amp;materialsCitation.latitude=-71.156" title="Search Plazi for locations around (long -13.980166/lat -71.156)">eastern Weddell Slope</a>, Kapp Norvegia, ANDEEP-III station 078-10; 71°09.39ʹ S, 13°59.30ʹ W to 71°09.36ʹ S, 13°58.81ʹ W; depth 2156– 2147 m; 21 Feb. 2005; EBS supranet • 1 ♀ imm. (BL = 21.0 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-36.522&amp;materialsCitation.latitude=-65.572" title="Search Plazi for locations around (long -36.522/lat -65.572)">Weddell Abyssal Plain</a>, ANDEEP-III station 102-13; 65°34.32ʹ S, 36°31.32ʹ W to 65°34.40ʹ S, 36°31.07ʹ W; depth 4805– 4803 m; 6 Mar. 2005; EBS epinet • 1 imm. (BL = 18.0 mm), 1 juv. (BL = 14.2 mm); Weddell Abyssal Plain, ANDEEP-III station 110-8; 65°00.52ʹ S, 43°02.09ʹ W to 65°00.68ʹ S, 43°02.16ʹ W; depth 4698– 4696 m; 10 Mar. 2005; EBS supranet • 1 juv. (BL = 10.2 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.587833&amp;materialsCitation.latitude=-59.673668" title="Search Plazi for locations around (long -57.587833/lat -59.673668)">Drake Passage</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.587833&amp;materialsCitation.latitude=-59.673668" title="Search Plazi for locations around (long -57.587833/lat -59.673668)">NW of Elephant Island</a>, ANDEEP-I station 042-2; 59°40.29ʹ S, 57°35.43ʹ W to 59°40.42ʹ S, 57°35.27ʹ W; depth 3683– 3680 m; 27 Jan. 2002; EBS epinet • 1 ♂ subad. (BL = 36.2 mm), 1 ♀ imm. (BL = 31.8 mm), 2 juv.; same collection data as for preceding; supranet • 1 ♀ subad. (BL = 45.5 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-56.0875&amp;materialsCitation.latitude=-60.454" title="Search Plazi for locations around (long -56.0875/lat -60.454)">South Shetland area</a>, NNW of Elephant Island, ANDEEP-I station 043-8; 60°27.12ʹ S, 56°05.10ʹ W to 60°27.24ʹ S, 56°05.25ʹ W; depth 3961.2–3962.4 m; 4 Feb. 2002; EBS epinet • 1 ♂ ad. (in 2 parts, BL = 47.8 mm), 2 ♂♂ imm. (BL = 17.1–20.9 mm), 1 ♀ imm. (BL = 19.9 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS epinet • 9 ♂♂ ad. (BL = 37.2–48.2 mm), 4 ♀♀ ad. (BL = 41.5, 46.2, 48.0, 48.9 mm), 6 subad., 11 imm., 52 juv.; same collection data as for preceding; supranet • 1 juv. (BL = 4.7 mm, in separate vial); same collection data as for preceding; supranet • 1 ♀ imm. (BL = 44.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-59.279835&amp;materialsCitation.latitude=-61.104" title="Search Plazi for locations around (long -59.279835/lat -61.104)">Drake Passage</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-59.279835&amp;materialsCitation.latitude=-61.104" title="Search Plazi for locations around (long -59.279835/lat -61.104)">N of South Shetland Islands</a>, ANDEEP-I station 099-4; 61°06.41ʹ S, 59°16.55ʹ W to 61°06.24ʹ S, 59°16.79ʹ W; depth 5190.4– 5190.4 m; 12 Feb. 2002; EBS supranet .</p><p>Type locality and distribution</p><p>In the original description, Willemoes-Suhm (1874) did not indicate which of the two potential localities near Crozet Island had yielded the new species. According to the station list of the Challenger Expedition (Murray 1895), this species was encountered only at station 147, i.e., 46°16ʹ S, 48°27ʹ E between Marion Island and Crozet Island, bottom (= trawling) depth 1600 fathoms (2926 m). This position is therefore regarded as the type locality. According to Hernández-Payán &amp; Hendrickx (2020) and Daneliya (2023) this species is known from the Arctic, Atlantic, Mediterranean, Pacific and the Southern Ocean at depths of 728–7200 m. The ANDEEP records are within previously known distribution ranges.</p></div>	https://treatment.plazi.org/id/EF7B8639FFD3FFB5FE670710FB04241E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFD4FFB4FDBF06D6FBFA2152.text	EF7B8639FFD4FFB4FDBF06D6FBFA2152.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Dactylamblyops Holt & Tattersall 1906	<div><p>Genus Dactylamblyops Holt &amp; Tattersall, 1906</p><p>Dactylamblyops Holt &amp; Tattersall, 1906b: 9 (Antarctic).</p><p>Chalcophthalmus Illig, 1906: 200, fig. 7 (junior synonym).</p><p>Dactylerythrops – Illig 1906: 199–200, fig. 6 (invalid generic assignment); 1930: 424 (in synonymy).</p><p>Dactylamblyops – W.M. Tattersall 1908: 29 (amended definition). — Tattersall &amp; Tattersall 1951: 260– 261 (diagnosis). — Ii 1964: 279–283 (key to species in the Far East, diagnosis). — Pillai 1965: 1706 (key to species in Indian waters, diagnosis). — Mauchline 1980: 27 (taxonomy, in key to genera). — Murano 1981: 275–278 (definition of species groups, key to species). — Kazmi et al. 1999: 149 (Arabian Sea, in taxa list, in key). — Nouvel et al. 1999: 79 (taxonomy, in list of genera). — San Vicente 2010: 44, 59 (Antarctic, diagnosis, key to species). — San Vicente &amp; Cartes 2011: 463–464 (key to species of hodgsoni -group). — Petryashov 2014a: 149 (biogeography, Antarctic). — Wittmann et al. 2014: 334 (taxonomic assignment).— Wittmann &amp; Chevaldonné 2021: 199, 208, 211 (morphology, sensory organs). — Mees &amp; Meland 2024: Aphia-ID 119851 (accepted).</p><p>Chalcophthalmus – Illig 1930: 425 (in synonymy). — Mees &amp; Meland 2024: Aphia-ID 226149 (unaccepted).</p><p>Diagnosis</p><p>Carapace normal. Eyes stalked, set apart, lateral margins not produced in a finger-like non-sensory process; stalk with ocular papilla; visual elements incomplete. Appendix masculina well developed. Antennal peduncle with three segments in linear arrangement; lateral margin of scale being bare up to an apical tooth or (in D. latisquamosus) only to a subapical tooth. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile, endopods 3–8 with unsegmented carpus separated from 1–2-segmented propodus by an oblique articulation. Female with three pairs of oostegites. Female pleopods reduced to uniramous setose plates. Male pleopods biramous, setose, no spines; endopod 1 unsegmented, endopods 2–5 and all exopods multi-segmented. Both rami of uropods unsegmented, setose all around; endopod with or without spine. Telson normal, no lateral constriction, no terminal incision, lateral margins not serrated; terminal and part of lateral margins with spines, no setae.</p><p>Type species</p><p>Dactylamblyops Hodgsoni Holt &amp; Tattersall, 1906, by original designation according to ICZN (1999).</p><p>Revised combinations</p><p>Dactylamblyops laticauda Birstein &amp; Tchindonova, 1958 is here recombined as Amblyopsoides laticauda (Birstein &amp; Tchindonova, 1958) comb. nov. (see below). The binomen Dactylamblyops japonica Ii, 1964 is here acknowledged based on the species having an antennal scale with a bare lateral margin up to a large apical tooth. In contrast, the type species of Hyperamblyops Birstein &amp; Tchindonova, 1958, i.e., H. nana Birstein &amp; Tchindonova, 1958, shows an antennal scale with a setose outer margin not ending in a tooth. Accordingly, the recombination of D. japonica Ii, 1964 as H. japonica (Ii, 1964) by Murano (1975) is not acknowledged here.</p><p>Species included (16 species acknowledged)</p><p>– D. atlanticus Murano &amp; Mauchline, 1999 from the NE Atlantic: Ireland Trough, 55° N 12° W, depth 2500 m (Murano &amp; Mauchline 1999)</p><p>– D. benthophilus sp. nov. from the Southern Ocean: South Sandwich Trench, Weddell Sea, Powell Basin, Drake Passage, 58– 71° S, 14– 65° W, depth 756–4805 m</p><p>– D. corberai San Vicente &amp; Cartes, 2011 from the Mediterranean, 38– 41° N, 2– 22° E, depth 358– 1858 m (San Vicente &amp; Cartes 2011; San Vicente 2017)</p><p>– D. fervidus Hansen, 1910 from the Indian Ocean: off Moluccas, 1° S, 127° E, depth ≤ 1500 m (Hansen 1910)</p><p>– D. goniops W.M. Tattersall, 1907 from the NE Atlantic: Ireland, Faroes, Bay of Biscay, 44– 60° N, 2– 12° W, depth 585–1331 m (W.M. Tattersall 1907; Tattersall &amp; Tattersall 1951; Nouvel &amp; Lagardère 1976; Frutos &amp; Sorbe 2013; San Vicente et al. 2013; Rios et al. 2022)</p><p>– D. hodgsoni Holt &amp; Tattersall, 1906 from the Southern Ocean, 44– 75° S, 80° E – 9° W – 162° W, depth 200–4200 m (Holt &amp; Tattersall 1906b; Zimmer 1914; Birstein &amp; Tchindonova 1962; San Vicente &amp; Cartes 2011; Wittmann &amp; Ariani 2019; Wittmann &amp; Chevaldonné 2021)</p><p>– D. iii Nouvel &amp; Lagardère, 1976 from the NW Pacific: off Japan, 34– 35° N, 138– 140° E, depth 70–1300 m, ≤ 2000 m (Ii 1964; Nouvel &amp; Lagardère 1976; Murano 1981; Wittmann &amp; Ariani 2019; Wittmann &amp; Chevaldonné 2021)</p><p>– D. japonicus Ii, 1964, from the NW Pacific: off Japan, 34– 35° N, 138– 139° E, depth ≤ 2300 m (Ii 1964)</p><p>– D. latisquamosus (Illig, 1906) from Indonesia: off Sumatra, 10– 0° N, depth ≤ 800 m (Illig 1906, 1930)</p><p>– D. murrayi W.M. Tattersall, 1939 from the Arabian Sea and Weddell Sea, total range 35° N – 63° S, 28° W – 139° E, depth ≤ 480 to 4543 m (W.M. Tattersall 1939; San Vicente &amp; Cartes 2011; Wittmann &amp; Ariani 2019; Wittmann &amp; Chevaldonné 2021; present paper: 7)</p><p>– D. pellucidus Birstein &amp; Tchindonova, 1958 from the NW Pacific: off Japan, Kuril-Kamchatka Trench, 30– 42° N, 137– 152° E, depth 4400–5140 m (Birstein &amp; Tchindonova 1958; Golovan et al. 2019). Specimens from about 1000 m off Japan reported by Murano (1981) as D. pellucida are not acknowledged due to their having fewer (0–1 vs 4) spines on the endopod of the uropods and more (32 vs 25) spines on the lateral margins of the telson, compared to the original description</p><p>– D. sarsi (Ohlin, 1901) from the Arctic Ocean: Spitzbergen (Ice Fjord), Amundsen Basin, 78– 83° N, circumpolar (14° E – 121° E – 129° W), depth 50–4320 m (Ohlin 1901; Petryashov 1993, 2014b)</p><p>– D. solivagus Birstein &amp; Tchindonova, 1958 from the N Pacific: Kurile-Kamchatka Trench, 50° N, 155° E, depth 500–640 m (Birstein &amp; Tchindonova 1958)</p><p>– D. stenurus Murano, 1969 from the NW Pacific: off Japan, 32– 35° N, 139– 140° E, depth&gt; 1000 m, ≤ 2300 m (Murano 1969, 1981)</p><p>– D. tenellus Birstein &amp; Tchindonova, 1958, from the NW Pacific: off Japan, 28° N, 131° E, depth ≤ 6600 m (Birstein &amp; Tchindonova 1958)</p><p>– D. thaumatops W.M. Tattersall, 1907 from the NE Atlantic: Iceland, Faroes to Bay of Biscay, 44– 61° N, 2– 17° W, depth 995–2295 m (W.M. Tattersall 1907; Tattersall &amp; Tattersall 1951; Nouvel &amp; Lagardère 1976; Corbari &amp; Sorbe 2001; Astthorsson &amp; Brattegard 2022)</p></div>	https://treatment.plazi.org/id/EF7B8639FFD4FFB4FDBF06D6FBFA2152	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFD6FFB8FDB8056EFD6C27E8.text	EF7B8639FFD6FFB8FDB8056EFD6C27E8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Dactylamblyops murrayi W. M. Tattersall 1939	<div><p>Dactylamblyops murrayi W.M. Tattersall, 1939</p><p>Figs 1–2</p><p>Dactylamblyops murrayi W.M. Tattersall, 1939: 235–237, figs 9–10 (Arabian Sea).</p><p>Dactylamblyops murrayi – Ii 1964: 289–293, figs 74–75 (detailed description, NW Pacific). — Pillai 1964: 3 (in list of Indian species); 1965: 1706–1707, fig. 53 (diagnosis, in key). — Murano 1971: 47 (in species list for Central Japan); 1981: 281–282, fig. 8 (supplementary description). — Ariani et al. 1993: table 1 (statolith structure). — Kazmi et al. 1999: 149, fig. 31 (in illustrated key to Arabian Sea species). — San Vicente &amp; Cartes 2011: 464, table 2 (in key to species of Dactylamblyops, distribution). — Wittmann &amp; Ariani 2019: suppl. (statolith composition, record). — Wittmann &amp; Chevaldonné 2021: table 1 (morphology, sensory structures). — Mees &amp; Meland 2024: Aphia-ID 226736 (accepted).</p><p>Diagnosis</p><p>Covers adults of both sexes. All features within limits of generic diagnosis. Carapace with broad triangular rostrum almost extending to distal margin of proximal segment of antennular trunk. Eyes shortly set apart, dorsoventrally compressed, cornea not divided by a ledge; ocular papilla with length ⅓–½ cornea diameter. Antennal peduncle with oblique border between median and terminal segment (Fig. 1E). Scale unsegmented, length 4–5 times maximum width; scale extending ⅕–⅓ of its length beyond antennular trunk; mesial margin setose, bare outer margin ending in a tooth. Setose terminal lobe of scale not projecting beyond disto-lateral tooth. Thoracic endopods not subchelate. Females with three pairs of oostegites. Male pleopods with endopods 2–5 and all exopods 10-segmented, no modified setae. Endopod of uropods with a single spine on inner margin below statocyst. Telson linguiform, with slightly sigmoid lateral margins, and with convex, continuously rounded terminal margin; length twice maximum width near basis. Proximal half of telson with bare lateral margins, distal half of each lateral margin with 18–32 densely set spines increasing in length distally. Terminal margin with three pairs of spines in continuous series with the lateral spines; no small spine between pair of large paramedian spines. Telson with total of 43–70 spines.</p><p>Material examined (non-type)</p><p>SOUTHERN OCEAN • 1 ♀ ad. (damaged, estimated BL ≈ 15.6 mm); NE Weddell Sea, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-27.909&amp;materialsCitation.latitude=-62.968166" title="Search Plazi for locations around (long -27.909/lat -62.968166)">Kosminski Fracture Zone</a> deep, ANDEEP-II station 138-6; 62°58.09ʹ S, 27°54.54ʹ W to 62°58.02ʹ S, 27°54.25ʹ W; depth 4542.5– 4541.1 m; 17 Mar. 2002; EBS supranet.</p><p>Supplementary description</p><p>EYES (Fig. 1A–D). As in diagnosis. Eyes dorsoventrally compressed by a factor of 2.4, reaching beyond median segment of antennular trunk in obliquely lateral orientation. Eyes roughly pyriform in dorsal view but lens-shaped (bolster-shaped) in lateral view (Fig. 1D). Cornea transversely positioned distally on eyestalk. It contributes to about half of eye surface. Numerous, loosely set (Fig. 1B), imperfectly developed ommatidia reach surface. Eyestalk disto-laterally with large ocular papilla anteriorly extending beyond eye (Fig. 1A). Eye papilla ends in a toroid with pore in center (Fig. 1C). Organ of Bellonci near ocular papilla. Anterior margin of cephalon with subrostral, median process reaching only to proximal third of proximal segment of antennular trunk; this process wide-angled, distally bluntly rounded.</p><p>ANTENNAE (Fig. 1E). Antennula furnished with antennular bursa as in D. benthophilus sp. nov. Female lobe of D. murrayi with minute setae; this lobe smaller than that of D. benthophilus (Fig. 5B). Distal portions of antennal scale broken; its proximal fragment with setose mesial margin and bare lateral margin.</p><p>THORAX. Dorsal portions of thorax and carapace including rostrum broken.All thoracopods broken, only sympods and oostegites remaining. Presence of 1–2 long, thick, densely barbed setae on membranous joints between at least thoracic sternites 6–7 and their respective sympods.</p><p>MARSUPIUM (Fig. 2A–C). Formed by three pairs of setose oostegites strongly increasing in size caudally. Each oostegite of present specimen proximally with brush of essentially smooth setae, some of which are distally armed with a few minute stiff bristles. Only oostegites 2–3 with series of setae along lower and caudal margins, these setae with caudally increasing incidence and size of barbs. Inner face of each oostegite with one flagellate seta showing no suture between thick handle and long slender flagellum. Only oostegite 1 with an additional smaller seta of that kind subbasally on lower margin. Only oostegite 3 with ≈ 30 slender whip setae (suture present between handle and flagellum) loosely scattered over outer face near ventral and caudal margins.</p><p>PLEON. Contributes 52% and telson 16% to estimated total length of 15.6 mm in this damaged adult female. Pleomeres 1–5 are 0.6, 0.5, 0.5, 0.5 and 0.4 times as long as pleomere 6, respectively; this value is 1.2 for telson. Female pleopods unsegmented setose rods with pseudobranchial lobe; pleopod length increases caudally.</p><p>TAIL FAN (Figs 1F, 2D). Exopod of uropods 1.5–2.0 times as long as telson, endopod 1.1–1.5 times as long as telson. Statoliths composed of fluorite. Telson linguiform with converging, slightly sigmoid lateral margins. Proximal half of each lateral margin bare, distal half with ≈32 spines, estimated based on remnants of broken spines (Fig. 1F), spines on average increasing in length distally; most spines of terminal margin broken.</p><p>Type locality and distribution</p><p>The type locality by monotypy is the Indian Ocean, northern Arabian Sea, 23°02.5ʹ N, 64°15.9ʹ E, oblique tow in 1500–0 m (W.M. Tattersall 1939; coordinates in Sewell 1935). This species was reported by Ii (1964), Murano (1981) and Wittmann &amp; Chevaldonné (2021) from the NW Pacific, deep waters off Japan, 28° N – 36° N, 129° E – 140° E, depth 480–1200 m. All other previously published references refer to materials from these localities. The present ANDEEP record from the Southern Ocean, NE Weddell Sea, 63° S, 28° W, depth 4541–4543 m, represents strong latitudinal and bathymetric extensions of the known range. The species, so far classified as panthalassic in meso- to bathypelagic depths, has now also been recorded from bathybenthic habitats.</p></div>	https://treatment.plazi.org/id/EF7B8639FFD6FFB8FDB8056EFD6C27E8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFD9FFA2FD8C059CFE4922FB.text	EF7B8639FFD9FFA2FD8C059CFE4922FB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Dactylamblyops benthophilus Wittmann 2024	<div><p>Dactylamblyops benthophilus sp. nov.</p><p>urn:lsid:zoobank.org:act: 986D4F91-F730-429C-9071-BC6015BE7D26</p><p>Figs 3–8</p><p>Dactylamblyops sp. A – Wittmann &amp; Chevaldonné 2021: fig. 24c–d.</p><p>Diagnosis</p><p>Covers adults of both sexes. All features within limits of generic diagnosis. Carapace with triangular, distally broadly rounded rostrum covering only small portion of eyestalks. Eyes shortly set apart, pyriform to sub-conical, dorsoventrally compressed; sub-conical cornea with residual visual elements, cornea not divided by a ledge; ocular papilla near antero-mesial edge, length of papilla ⅒–⅕ cornea diameter, not extending beyond cornea. Antennal peduncle with oblique border between median and terminal segment. Scale with small terminal segment, scale length 4.4–5.5 times maximum width; scale extending 0.3–0.4 of its length beyond antennular trunk; mesial margin setose, bare outer margin ending in a tooth. Setose terminal lobe of scale not projecting beyond disto-lateral tooth. Mouthparts normal, labrum rostrally rounded. Thoracic endopods not subchelate. Females with three pairs of oostegites. Endopods of male pleopods 1–5 with 1, 13–14, 14, 13–14 and 12–13 segments, exopods with 13–14, 14, 14, 14 and 14 segments, respectively. No modified setae on pleopods of both sexes. Endopod of uropods with one minute spine on inner margin below statocyst. Telson elongate triangular with slightly sigmoid, continuously converging lateral margins, length 1.6–1.9 times maximum width near basis; proximal half with bare lateral margins, distal half of each lateral margin with 24–31 densely set spines increasing in length distally; apex with three large spines in continuous series with lateral spines, no small spine and no seta between large apical spines; telson with total of 51–64 spines. Differentiation from similar taxa given in ‘Discussion’.</p><p>Etymology</p><p>The species name is an adjective with Latinized masculine ending, underlining the more benthophilic habit compared with the sympatric, more pelagic congener D. hodgsoni .</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♂ ad. (BL = 22.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.015833&amp;materialsCitation.latitude=-58.4155" title="Search Plazi for locations around (long -25.015833/lat -58.4155)">South Sandwich Trench</a>, E of Montagu Island, ANDEEP-II station 141-10; 58°25.08ʹ S, 25°00.77ʹ W to 58°24.93ʹ S, 25°00.95ʹ W; depth 2313– 2281 m; 23 Mar. 2002; EBS supranet; ZMH 64669.</p><p>Paratypes SOUTHERN OCEAN • 2 ♀♀ ad. (BL = 20.9–25.4 mm), 2 damaged juv.; same collection data as for holotype; ZMH 64672 • 1 ♂ ad. (BL = 19.9 mm); SE Weddell Sea,ANDEEP-III station 074-6; 71°18.35ʹ S, 13°57.71ʹ W to 71°18.28ʹ S, 13°57.31ʹ W; depth 1030–1040 m; 20 Feb. 2005; EBS supranet; ZMH 64673 • 1 ♀ ad. (BL = 23.9 mm), 1 ♀ subad. (in 2 parts, BL = 16.0 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-13.980166&amp;materialsCitation.latitude=-71.156" title="Search Plazi for locations around (long -13.980166/lat -71.156)">eastern Weddell Slope</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-13.980166&amp;materialsCitation.latitude=-71.156" title="Search Plazi for locations around (long -13.980166/lat -71.156)">Kapp Norvegia</a>, ANDEEP-III station 078-10; 71°09.39ʹ S, 13°59.30ʹ W to 71°09.36ʹ S, 13°58.81ʹ W; depth 2156– 2147 m; 21 Feb. 2005; EBS epinet; ZMH 64675 • 1 ♂ ad. (fragment, BL = 17.0 mm, on slides); same collection data as for preceding; ZMH 64674 • 4 ♀♀ ad. (BL = 17.8–24.0 mm), 1 ♂ ad. (BL = 20.0 mm), 2 ♀♀ subad., 3 ♂♂ subad., 1 imm.; same collection data as for preceding except for occurrence in EBS supranet; ZMH 64677 • 1 ♀ ad. (BL = 21.8 mm, on slides); same collection data as for preceding; ZMH 64676 • 1 ♂ ad. (BL = 20.3 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS supranet; ZMH 64670 • 1 ♂ ad. (BL = 24.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.7425&amp;materialsCitation.latitude=-61.725666" title="Search Plazi for locations around (long -60.7425/lat -61.725666)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 114-4; 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W; depth 2914–2920 m; 18 Feb. 2002; EBS supranet; ZMH 64671 • 1 ♀ ad. (BL = 19.3 mm), 1 ♂ subad. (damaged, BL ≈ 15 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-64.61967&amp;materialsCitation.latitude=-63.319168" title="Search Plazi for locations around (long -64.61967/lat -63.319168)">Bellingshausen Sea</a>, NW of Anvers Island, ANDEEP-III station 153-7; 63°19.31ʹ S, 64°36.94ʹ W to 63°19.15ʹ S, 64°37.18ʹ W; depth 2092–2118 m; 29 Mar. 2005; EBS supranet; ZMH 64678 .</p><p>Other material</p><p>SOUTHERN OCEAN • 1 juv. (BL = 6.7 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.1745&amp;materialsCitation.latitude=-58.7415" title="Search Plazi for locations around (long -25.1745/lat -58.7415)">South Sandwich Trench</a>, SE of Montagu Island, ANDEEP-II station 143-1; 58°44.69ʹ S, 25°10.27ʹ W to 58°44.49ʹ S, 25°10.47ʹ W; depth 773.9– 755.6 m; 25 Mar. 2002; EBS epinet • 3 juv. (BL = 4.8–6.9 mm); same collection data as for preceding except for occurrence in supranet • 1 ♂ subad. (BL = 17.3 mm), 1 imm. (BL = 15.4 mm, in 2parts), 1juv.; NW Weddell Sea, ANDEEP-II station 132-2; 65°17.74ʹ S, 53°22.82ʹ W to 65°17.56ʹ S, 53°22.83ʹ W; depth 2086– 2086 m; 6 Mar. 2002; EBS supranet • 1 ♀ subad. (BL = 16.7 mm); NW Weddell Sea, ANDEEP-II station 133-3; 65°20.15ʹ S, 54°14.35ʹ W to 65°20.06ʹ S, 54°14.51ʹ W; depth 1122– 1119 m; 7 Mar. 2002; EBS supranet • 1 ♂ imm. (BL = 12.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-36.522&amp;materialsCitation.latitude=-65.572" title="Search Plazi for locations around (long -36.522/lat -65.572)">Weddell Abyssal Plain</a>, ANDEEP-III station 102-13; 65°34.32ʹ S, 36°31.32ʹ W to 65°34.40ʹ S, 36°31.07ʹ W; depth 4805– 4803 m; 6 Mar. 2005; recovered from sediment in web mug • 1 ♀ imm. (BL = 7.9 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.134&amp;materialsCitation.latitude=-61.757" title="Search Plazi for locations around (long -47.134/lat -61.757)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 151-7; 61°45.52ʹ S, 47°07.68ʹ W to 61°45.42ʹ S, 47°08.04ʹ W; depth 1182– 1185 m; 21 Mar. 2005; EBS epinet • 10 juv. (BL = 4.8–7.9 mm); same collection data as for preceding except for occurrence in supranet • 1 imm. (damaged, BL = 11.0 mm), 1 imm. (strongly damaged, BL ≈ 15 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS supranet • 1 juv. (BL = 6.7 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-58.863834&amp;materialsCitation.latitude=-61.404335" title="Search Plazi for locations around (long -58.863834/lat -61.404335)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 105-7; 61°24.16ʹ S, 58°51.55ʹ W to 61°24.26ʹ S, 58°51.83ʹ W; depth 2297.9–2307.5 m; 12 Feb. 2002; EBS supranet .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP II station 141-10: South Sandwich Trench, E of Montagu Island, 58°25.08ʹ S, 25°00.77ʹ W to 58°24.93ʹ S, 25°00.95ʹ W, depth 2313– 2281 m. The species was recorded in most major parts of the W Antarctic examined, range 58– 71° S, 14– 65° W, depth 756–4805 m. It was captured in the supranet in 11 out of 14 successive mysid samples taken with a self-closing epibenthic sledge, suggesting a suprabenthic mode of life close above the deep-sea floor.</p><p>Description</p><p>Body length 17.8–25.4 mm (n = 9) in adult females, 17.0– 24.4 mm (n = 6) in adult males. Rostrum measures 2–3% of BL, carapace without rostrum 31–36%, thorax 37–44%, pleon without telson 46– 52% and telson 6–9%.</p><p>CARAPACE (Figs 3A, 4D). Normal, antero-lateral edges produced, broadly rounded (Fig. 4D). Cervical sulcus strong, cardial sulcus indistinct, posterior margin concave, terminal indentation broadly rounded. No pores seen (though not excluded). Carapace leaving ½–1½ thoracomeres mid-dorsally exposed.</p><p>EYES (Figs 3A, 4D, 5F). Ocular symphysis with unpaired, proximally trapeziform, distally triangular, apically rounded interocular lobe (Fig. 4D), in dorsal view mistakable with an anterior extension of rostrum. Eyestalks smooth all around, 0.7–0.9 times as long as terminal segment of antennular trunk. Cornea obliquely, laterally positioned on eyestalk (Figs 3A, 4D), kidney-shaped in dorsal view, apparent length 0.7–0.8 of total eye length, width 0.3–0.4. Cornea appears whitish in ethanol-preserved material. Its antero-posterior extension 1.0–1.2 times length of terminal segment of antennular trunk. Eye papilla ends in a toroid with pore in center (Fig. 5F). Organ of Bellonci present near ocular papilla.</p><p>ANTENNULA (Figs 4A–B, 5A–E). Antennular trunk measures 10–12% of BL. It extends half its length beyond eyes. Measured along dorsal midline, basal segment 0.3–0.4 of trunk length, median segment 0.1–0.2 and terminal segment 0.4–0.6. Length of basal segment 0.7–0.8 of width; mid-dorsally with deep antennular bursa (Figs 4A, 5C–D) leading down to a striated pad at bottom. Basal segment not produced at outer distal edge (Fig. 4A); no mid-ventral carina. Disto-median lobe (Fig. 4B) of terminal segment with three teeth increasing in size laterally, lobe disto-laterally with four barbed setae. Appendix masculina (Figs 4A, 5A) inserts ventrally near terminal margin of antennular trunk; appendix conical, apically rounded, 0.5–0.9 times as long as terminal segment of trunk, strongly setose. Female lobe (Fig. 5B) 0.3 times as long as terminal segment, well-developed, albeit less strongly setose. Wittmann &amp; Chevaldonné (2021: fig. 24c–d) correctly figured this lobe as inserting ventrally but accidentally indicated it in text as inserting dorsally. Flagella large, width of outer flagellum measured near basis 1.3– 1.7 times width of inner flagellum. Basal portion of outer flagellum with ventral callynophore bearing broad row of densely set aesthetascs (Fig. 5E) in both sexes. Callynophore 0.6–0.7 times as long as terminal segment of antennular trunk.</p><p>ANTENNA (Fig. 4C). With smooth cuticle all around, not considering setae and disto-lateral tooth of antennal scale. Sympod 2-segmented, with large end sac of antennal gland. Sympod angular on disto-lateral edge, not forming a tooth-like projection. Antennal scale measures 16–20% of BL, 1.4–1.7 times as long as antennular trunk and 2.2–2.4 times as long as antennal peduncle. Scale 4.4–5.5 times as long as wide. Peduncle 3-segmented, its basal segment contributes 41–44% to total length, median segment 28–31% and terminal segment 27–29%.</p><p>LABRUM AND LABIUM (Fig. 4E, G). Labrum normal, rostrally forming a broad, rounded bulge; most caudal portions with strong lamellae and cover of scale-like fringes. Paired labia with stiff and normal setae, no spines, no teeth.</p><p>MANDIBLES (Fig. 4F). Palp 0.6–0.7 times as long as antennal scale. Palp not hispid, its basal segment without setae, remaining segments densely setose along mesial and lateral margins. Basal segment contributes 10–13%, median segment 49–54% and apical segment 37–40% to total palp length. Length of median segment 2.6–3.2 times maximum width; its mesial margin convex, lateral margin sigmoid. Length of apical segment 3.3–3.9 times maximum width. Masticatory part of mandibles normal, left and right mandibles alike: pars incisiva of both mandibles with 4–5 large teeth, and digitus mobilis with 5–9 teeth. Processus molaris with strong grinding lamellae not ending in teeth and with dense bundle of stiff bristles on proximal edge. Pars centralis of left mandible with series of 10–13 spines becoming more slender and with greater numbers of stiff bristles proximally, distalmost spine stout with few bristles. Pars centralis of right mandible with 6–9 slender, subequal spines bearing numerous stiff bristles.</p><p>GUT (Fig. 6). Foregut with lateralia, infoldings and superomedianum of cardiac chamber densely covered by smooth, slender setae and spines. Lateralia anteriorly with dense series of slender, apically coronate, bluntly pronged spines (Fig. 6B) of various length and with slender, mostly blunt spines, in part with minute apical tooth (Fig. 6C). Posterior part of lateralia on each side of foregut with a complex of three unilaterally finely serrated spines arising from a common base (Fig. 6D 2) and a second complex with four medium-sized plus at least three small spines of that kind (Fig. 6D 1). Dorsolateral infoldings on each side with a pair of larger, unilaterally more coarsely serrated, bent spines (Fig. 6E). Content of five foreguts mainly masticated, unidentifiable organic material (detritus), mineral particles, foraminifera and one fragment of a polychaete larva. Telson with ventrally prominent anal lobe (Fig. 6F–G, dashed line in Fig. 8G). Lobe caudally bifid with thick cuticle, superficially resembling glutei separated by an intergluteal furrow (Fig. 6G).</p><p>MAXILLULA (Fig. 4H). Distal segment with 10–12 strong spines on transverse terminal margin, several spines subterminally serrated on outer margin. This segment subterminally with 7–10 setae bearing stiff barbs; total of 7–9 pores flanking outer (= most ventral = aboral) seta on both its sides. Endite of maxillula terminally with three large, distally spiny setae, on both sides accompanied by numerous less strong setae. As a striking feature, most proximal seta of endite long, slender and curved backward.</p><p>MAXILLA (Fig. 7A). Sympod with four mesial lobes, densely setose along their disto-mesial margins. Large proximal lobe with large, dense fan of simple setae. Only one large seta extends beyond this fan, on caudal face, at margin near distally neighboring lobe; this seta bears a dense unilateral series of stiff barbs along its distal half. It is proximally followed by loose series of 7–13 shorter, thin setae unilaterally microserrated at least on their distal half (these setae covered by fan in Fig. 7A); this series extends over ⅔ of fan length. All four lobes with furry stripes of fine hairs on mesial portions of only caudal face; this is below drawing plane, thus stripes not visualized in Fig. 7A. Exopod of maxilla ends shortly before terminal margin of basal segment of palp. Exopod with total of 24–33 plumose setae all along lateral margin, subapically with only 0–1 seta on mesial margin; tip with 1–2 comparatively large setae; lateral margin with 19–26 intermediate-sized setae, subequal among each other, plus 3–5 large setae in most basal position. Mesial margin bare except, if any, for above-mentioned subapical seta. Maxillary palp with apical segment contributing 55–64% to palp length, no spines. Apical segment 1.6–1.8 times as long as maximum width. Basal segment less wide, subbasally with mesial bulge (endite) bearing 5–7 barbed, basally thick setae. Distal ¾ of apical segment all around with barbed setae except for a bare sector along central third of terminal margin. Mesial third of this segment with furs of tiny hairs on rostral and caudal faces (only rostral fur visualized in Fig. 7A).</p><p>THORAX (Figs 3C–D, 7B–K). Intersegmental joints between sternites and sympod 2 with basally thick, all along barbed seta accompanied by five smaller barbed setae (Fig. 7F). Sympods 3–8 with one large seta accompanied by one smaller seta of that type (Fig. 7H). No such setae on sympod 1. Thoracic sternites to various extent covered by fur of minute hairs in both sexes (shaded areas in Fig. 7B). Basal plates of thoracic exopods with smooth cuticle, length twice maximum width (Fig. 7B), plates widening distally up to ⅔ of length, plates with rectangular disto-lateral corner. Epipod 1 leaf-like, about as long as combined ischium, merus and carpus of endopod 1, no seta (Fig. 7B). Endopods with smooth cuticle, not considering setae and pores. Coxa of endopod 1 (Fig. 7B) with small mesial lobe apically bearing one barbed seta; basis with large, setose endite, remaining segments without endite; dactylus with field of about 40–60 pores, diameter &lt;2 µm, on caudal face (Fig. 7C, E). Endopods 1–2 with six segments (Fig. 7B, F), remaining endopods with eight segments counting from basis to dactylus (Fig. 7H). Carpus 3–8 unsegmented; strongly oblique suture between carpus and propodus; less oblique, almost transverse suture between two segments of propodus (Fig. 7H). Dactyli 3–8 more slender than dactyli 1–2. Dactylus 1 with almost straight, subapically slightly serrated nail (Fig. 7C–D); dactylus 2 not reflexed; dactyli 2–8 with short, more slender, slightly bent, smooth nail (Fig. 7G, I). Endopod 3 extends shortly beyond antennular trunk when stretched anteriorly, endopod 8 to mandibles. Endopod 8 extends to pleomere 4 when stretched posteriorly. Penes (Fig. 7K) with subterminal ejaculatory opening, with setose, terminally rounded caudal lobe, and with non-setose, terminally rugose, triangular rostral lobe.</p><p>MARSUPIUM (Fig. 7J). Empty in all females of this material. Oostegite length increases by a factor of 2.8 from oostegite 1 to 3. Basal portions of dorsal margin without setae in oostegites 1–2 and from basal to subapical portions in oostegite 3. All oostegites with smooth cuticle, not considering setae. Their ventral and anterior margins plus part of posterior margin with dense series of barbed setae. Posterior parts of oostegites 1–3 on inner face with comparatively long setae microserrated on their distal half. Only oostegites 2–3 with numerous, on average shorter, slender smooth setae on outer face. These setae positioned all along ventral portions in large oostegite 3, and only in median to subapical portions on ventral fifth of oostegite 2.</p><p>PLEON (Figs 3C–D, 8A–E). Length of pleomeres 1–5 is 0.5–0.8, 0.6–0.8, 0.5–0.6, 0.4–0.6 and 0.5–0.7 times length of pleomere 6, respectively. Pleomere 6 shorter than combined length of pleomeres 4–5. Male pleopods with longitudinal series of setae on lateral (= rostral) face of sympod 1 (Fig. 8A), no setae on sympods 2–5 (Fig. 8B). Basal segment of endopod in all male pleopods with subrectangular, terminally rounded, setose pseudobranchial lobe; exopods of subequal size. Size of female pleopods increasing caudally. Female pleopod 1 with residual differentiation of pseudobranchial lobe (endopod), in pleopods 2–5 represented only by a short setose bulge. Scutellum paracaudale well rounded, sinusoid.</p><p>TAIL FAN (Fig. 8F–I). Telson, endopod and exopod of uropods are 1.0–1.2, 1.2–1.4 and 1.8–2.1 times length of sixth pleomere, respectively. Exopod of uropods (Fig. 8F) straight, 1.8–2.1 times as long as telson, endopod 1.1–1.5 times as long as telson and 0.7 times as long as exopod. Exopod extends 0.3–0.4 times its length beyond endopod and 0.5–0.6 times beyond telson; endopod extends 0.3 times its length beyond telson. Exopod with slightly convex, almost straight lateral margin and with weakly convex mesial margin. Both margins about parallel on proximal half, then converging up to truncate terminus with rounded edges. Margins of endopod converging in a V-shaped manner up to narrowly blunt terminus. Uropods (Fig. 8F) with smooth cuticle, not considering setae and single spine. Statoliths composed of fluorite, form sub-hemispherical with roughly plane fundus, as also found in other Erythropinae by Wittmann et al. (1993). Diameter 0.25–0.35 mm (n = 6), thickness ⅔ of diameter; no tegmen differentiated. Statolith formula 1 + 3 + (5–6) + (10–19) = (20–29) (n = 4). Telson (Fig. 8G, I) with pair of paramedian subbasal fields of 90–125 pores (Fig. 8G–I), pore diameters &lt;3 µm. Telson with 2–7 µm long and 0.5–0.8 µm wide triangular scales (as in Fig. 36B) organized in clusters of about 10–25 scales. Clusters together form a narrow longitudinal ribbon (nearly as in Fig. 19D but shorter and partly broader) proceeding close to each lateral margin along ⅓–⅔ of telson length from basis (shaded areas in Fig. 8G).</p></div>	https://treatment.plazi.org/id/EF7B8639FFD9FFA2FD8C059CFE4922FB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFC3FFA6FD8B012AFBD522CE.text	EF7B8639FFC3FFA6FD8B012AFBD522CE.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Thalassomysis tattersalli Nouvel 1942	<div><p>Thalassomysis tattersalli Nouvel, 1942</p><p>Figs 9–10</p><p>Thalassomysis tattersalli Nouvel, 1942: 6–8, figs 12–17 (preliminary diagnosis).</p><p>Thalassomysis Tattersalli – Nouvel 1943: 59–61, figs 85–102 (detailed description).</p><p>Thalassomysis tattersalli – Murano &amp; Krygier 1985: 692–693, fig. 4 (range extension, supplementary description). — San Vicente 2017: table 1 (distribution range). — Mees &amp; Meland 2024: AphiaID 931983 (accepted).</p><p>Diagnosis</p><p>Covers adult female and non-adult males (the latter described here for the first time). Carapace normal, anterior margin with semicircular projection covering part of eyestalks. Eyes separately set in sublateral position, dorsally with papilla. Eye structure and size of papilla varying with body size (see Notes below and ‘Discussion’). Antennular trunk with three segments separated by transverse articulations. Antennal peduncle 4-segmented with oblique border between small third and larger, dorsally overlapping fourth segment. Antennal scale entire, setose all around, extending half its length beyond antennal peduncle and ⅖ beyond antennular trunk. Scale six times as long as wide, setose lateral margins parallel, tip rounded, no tooth. Labrum rostrally rounded, caudally strongly asymmetrical due to mesially rugose, distally rounded caudal projection from lateral third of caudal margin. Labium with transverse distal margin. Thoracic endopods 1–2 normal; endopods 3–8 and all exopods unknown. Female with four pairs of oostegites. Pleopods 1–5 of subadult male setose, no spines; pleopod 4 biramous, remaining pleopods uniramous. Female pleopods reduced to uniramous setose plates increasing in length caudally. Pleomere 6 with pair of carinae running along ventro-lateral edge and narrowing caudally. Both rami of uropods unsegmented, setose all around, no spines. Telson triangular, slender, 3.2–3.7 times as long as maximum width at basis, and 15–22 times as long as maximum width at convex terminus, lateral margins not serrated, with 11–17 spines on distal ⅔, spines distally somewhat discontinuously increasing in length and width; narrow terminal margin with four spines; total of 27–37 spines, no setae.</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 ♂ imm. (BL = 13.4 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-43.015167&amp;materialsCitation.latitude=-64.9995" title="Search Plazi for locations around (long -43.015167/lat -64.9995)">northern Weddell Abyssal Plain</a>, ANDEEP-II station 135-4; 65°00.06ʹ S, 43°01.19ʹ W to 64°59.97ʹ S, 43°00.91ʹ W; depth 4677.6– 4678.2 m; 11 Mar. 2002; EBS supranet • 1 ♀ imm. (BL = 10.3 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-0.0365&amp;materialsCitation.latitude=-67.4935" title="Search Plazi for locations around (long -0.0365/lat -67.4935)">eastern Weddell Abyssal Plain</a>, S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet • fragment of one subad. ♂ (posterior ⅔ of body, estimated BL ≈ 14 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-20.458666&amp;materialsCitation.latitude=-68.060165" title="Search Plazi for locations around (long -20.458666/lat -68.060165)">Weddell Abyssal Plain</a>, ANDEEP-III station 088-8; 68°03.66ʹ S, 20°27.90ʹ W to 68°03.61ʹ S, 20°27.52ʹ W; depth 4929–4931 m; 27 Feb. 2005; EBS supranet .</p><p>First description of (non-adult) males</p><p>Eyes proximally connected by a large transverse symphysis (Fig. 10B). Cornea opaque, eyestalk with pattern of transparent and opaque parts. Ommatidia without rhabdom, nonetheless forming a compact laterally positioned cornea (Fig. 10D) delimited from eyestalk. Eyestalk (Fig. 10B, D–E) with large ganglion mass. Eye dorsally with ocular papilla measuring ⅕ of antero-posterior eye extension, in loco facing upwards (Fig. 10A). Small pore at tip of ocular papilla (Fig. 10C). Organ of Bellonci (Fig. 10E) close to basis of papilla; this organ with numerous sensory cells with a neck and (out of focus in Fig. 10E) large vacuole. Antennular trunk without antennular bursa. Vestigial appendix masculina in dissected immature male with BL 13.4 mm. Four barbed setae disto-laterally on disto-median lobe of antennular trunk, no teeth. Eyes bolster-shaped (Fig. 10A), dorsoventrally compressed by a factor of 1.9. Foregut with unidentifiable masticated material, abundant crustacean remains fragmented to small pieces and a minor number of small mineral particles. Ingested setal fragments thicker than found elsewhere in this mysid, so potential ingestion of own exuvia excluded in this case. Thoracic sternite 1 with rounded mid-anterior projection. Thoracomeres 2–8 without mid-sternal processes.</p><p>Eyes and antennula not available in fragment of subadult male with estimated BL ≈ 14 mm. This specimen with pyriform penes (Fig. 9B); several setae associated with terminal ejaculatory opening; spermatozoa visible in efferent ducts. Pleopods 1–3, 5 (Fig. 9E–F) of both available non-adult males represent uniramous setose plates increasing in length caudally; pleopod 4 longest, biramous with unsegmented, plate-like, setose endopod. Exopod 4 (Fig. 9D) 2–3-segmented only in subadult male. The still rudimentary aspect of this exopod suggests a much larger (multi-segmented?) exopod 4 in the so far unknown adult male. Exopod of uropods extending 0.2–0.3 times its length beyond endopod and 0.1–0.2 times beyond telson. Endopod not forming an external suture. Statocyst chamber well delimited by internal cuticle only. Statoliths distinct, without mineral (probably accidentally demineralized in present material). No setae, pores or scales detected on telson. Anal lobe distinct, weakly cuticularized.</p><p>Notes on immature female</p><p>Non-dissected immature female with BL 10.3 mm (Fig. 9A), showing pyriform eyes, dorsoventrally compressed by a factor of 1.4. Ocular papilla measuring ⅓ of antero-posterior eye extension. Cornea compact, well delimited from eyestalk, with ommatidia reaching surface. Cornea brown, well contrasting from opaque eyestalk even after 18 years of preservation in ethanol. Pigmented cornea with ommatidia reaching surface, together with ganglion mass present in eyestalk, suggesting some visual abilities (see ‘Discussion’). No female lobe detected. Thoracic endopod 2 very long (bent in Fig. 9A), extending beyond antennular trunk when stretched anteriorly. Endopods 3–8 broken, as in other conspecific specimens in ANDEEP material.</p><p>‘Ovoid organ’</p><p>Nouvel (1942, 1943) reported “un petit organe ovoïd longuement pédonculé” on a seta of the maxillula in T. tattersalli . Murano &amp; Krygier (1985) found no such structure in material of this mysid species and assumed that the structure reported by Nouvel could be a “small parasite or tumor” rather than an organ of a mysid. In fact, such ovoids (Fig. 9C) were also found in the present material and identified as settled spores of ellobiopsids (phylum Myzozoa: Ellobiopsida). The dissected subadult male with a total of twelve such spores on thoracic sternites, no spores elsewhere. The immature male with a single spore fixed to a seta of pleopod 2, four spores to the joint between the mandibles and labrum, and several spores on the antennular trunk. The available immature female not examined (not dissected) in this respect.</p><p>Type locality and distribution</p><p>This species was first described by Nouvel (1942, 1943) based on a single adult female taken during Cruise 1910 of the ‘Campagnes du Prince Albert 1 er de Monaco’, station 2983 in the Gulf of Biscay, 45°28ʹ N, 5°43ʹ W, vertical haul 4500–0 m, here regarded as type locality by monotypy. Murano &amp; Krygier (1985) published one adult and three non-adult females from three samples in the NE Pacific, about 100–750 km off the Oregon coast, 44– 45° N, 125– 134° W, taken with a beam trawl at depths of 2926–3724 m. The ANDEEP records are the first with (non-adult) males and are the first from the southern hemisphere: these specimens were taken with an epibenthic sledge on the Weddell Abyssal Plain at three stations at depths of 4655–4931 m, 65– 68° S, 00°– 43° W. The great distances between the three sea areas recorded so far point to a panoceanic abyssal distribution.</p></div>	https://treatment.plazi.org/id/EF7B8639FFC3FFA6FD8B012AFBD522CE	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFC7FFA8FDE9010BFE0721DB.text	EF7B8639FFC7FFA8FDE9010BFE0721DB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyops G. O. Sars 1872	<div><p>Genus Amblyops G.O. Sars, 1872</p><p>Amblyopsis G.O. Sars, 1869: 328–330 (junior homonym of the blind cave fish Amblyopsis De Kay, 1842).</p><p>Amblyops G.O. Sars, 1872a: 3–4 (replacement name for the junior homonym Amblyopsis, definition).</p><p>Pseudomma – M. Sars 1869: 262 (partim, in species list).</p><p>Amblyopsis – Stebbing 1893: 269 (in synonymy). — Hernández-Payán &amp; Hendrickx 2020: 178 (morphology, in comparison).</p><p>Amblyops – Banner 1948a: 382 (diagnosis). — Tattersall &amp; Tattersall 1951: 246–247 (description). — O.S. Tattersall 1955: 103–104 (comparison of species); 1965: 14–15 (list of generic characters, Antarctic). — Ii 1964: 271–272 (diagnosis; comparison with Amblyopsoides). — Birstein &amp; Tchindonova 1970: 284 (inventory, distribution). — Kathman et al. 1986: 95 (key to species, Northeast Pacific). — Tchindonova 1993: 153, 157 (taxonomy; distribution). — Murano 2012: 50–51 (diagnosis, revision). — Wittmann et al. 2014: 336, figs 18, 42 (morphology, taxonomy). — Meland et al. 2015: 4, 23 (eye morphology, biogeography). — Petryashov &amp; Frutos 2017: 404– 405 (taxonomy, in key). — Wittmann &amp; Chevaldonné 2021: 211 (morphology, sensory organs). — Mees &amp; Meland 2024: AphiaID 119832 (accepted).</p><p>Diagnosis</p><p>Carapace normal, no rostrum. Eye rudiments immotile, without stalks, closely set though separate, not connected by membranous integument, dorsoventrally compressed, reduced to essentially horizontal pads, no tooth-like non-sensory projection. Eyes without any or with strongly reduced ommatidia; ocular papilla present in most species.Antennal peduncle 4-segmented with oblique border between second and dorsally overlapping third segment. Scale with small apical segment; lateral margin bare up to a large tooth, in most species mesially accompanied by small teeth or spines; bare portion contributes more than ¾ of scale length. Thoracomeres and pleomeres normal. Thoracic endopods not prehensile, endopods 3–8 with unsegmented carpus separated from 2-segmented propodus by an oblique articulation. Female with 2–3 pairs of well-developed oostegites. Male pleopods biramous, setose, no spines; any ramus of pleopod 4 may bear modified setae. Endopod 1 unsegmented, all exopods and endopods 2–5 multi-segmented. Female pleopods reduced to uniramous setose plates with pseudobranchial lobe. Both rami of uropods unsegmented, setose all around; endopod without or with a few spines. Telson normal, no terminal incision, no lateral constriction, lateral margins not serrated. Most species with spines on lateral margins and with pair of setae flanked by spines on terminal margin.</p><p>Type species</p><p>Amblyopsis abbreviata G.O. Sars, 1869, by original designation according to ICZN (1999), Article 68.2.1. G.O. Sars (1872a) explicitly replaced the preoccupied generic name Amblyopsis G.O. Sars, 1869, with the modified name Amblyops G.O. Sars, 1872 . The subsequent designation of the nomenclatorial combination Amblyops abbreviatus (G.O. Sars, 1869) as type species by Murano (2012) does not fully conform to the Code; however, it is tautological in practice. The taxon is currently acknowledged as Amblyops abbreviatus (G.O. Sars, 1869) . As previously unknown features, the ocular papilla bears a terminal toroidal bulge surrounding a central pore, and the basal segment of the antennular trunk shows a dorsal antennular bursa, as revealed by the present inspection of six specimens from the Hjeltefjord in Norway, NE Atlantic, 61°35ʹ N, 4°55ʹ E, depth 260 m, 4 July 1978, leg. Jan Helge Fosså and Torleiv Brattegard. In both sexes of this material the length of the ocular papilla shows a wide range of 1/20–⅕ of the antero-posterior extension of the eye rudiments.</p><p>Nomenclatorial notes</p><p>The terms ‘ cauda ’ and ‘ spina ’ are Latin nouns rather than adjectives, so the original spellings of A. tenuicauda W.M. Tattersall, 1911, and A. aequispina Birstein &amp; Tchindonova, 1958, are here retained according to ICZN (1999: Art. 32.3). The use of these species names as adjectives would have required explicit statements upon first description (Art. 31.2.2). Due to the absence of such statements, the adjectives ‘tenuicaudus ’ and ‘aequispinus’ are considered incorrect subsequent spellings. The invalid spellings were recently used by Murano (2012), San Vicente (2017) and Astthorsson &amp; Brattegard (2022), the original spellings by San Vicente et al. (2013), Petryashov &amp; Frutos (2017), ITIS (2019), Golovan et al. (2019), Wittmann (2020) and Mees &amp; Meland (2024). Therefore, the potentially prevailing use of incorrect spellings does not match with ICZN (1999: Art. 33.3.1).</p><p>Species included (24 species acknowledged)</p><p>– A. abbreviatus (G.O. Sars, 1869) from boreal and arctic waters of the N Atlantic: Bay of Biscay, Ireland, Norway, Iceland Basin, off Greenland, Cape Cod area, Canadian Atlantic, 40– 81° N, 13– 72° W, depth 150–1400 m (Tattersall &amp; Tattersall 1951; Brandt et al. 1996; Dewicke 2002; Vanquickelberghe 2004; Murano 2012; Astthorsson &amp; Brattegard 2022), whereas Pacific populations were attributed to A. pacificus in the original description of the latter species by Murano (2012)</p><p>– A. aequispina Birstein &amp; Tchindonova, 1958 from the NW Pacific: Kurile-Kamchatka Trench, 43– 56° N, 152– 162° E, depth 4830–5780 m (Birstein &amp; Tchindonova 1958; Golovan et al. 2019)</p><p>– A. amamiensis Murano, 2012 from the NW Pacific: Amami-Ohshima Island, SW Japan, 29° N, 130° E, depth about 1000 m (Murano 2012)</p><p>– A. antarcticus O.S. Tattersall, 1955 from the Southern Ocean: South Sandwich Islands, South Shetland Islands, Ross Sea, Weddell Sea, 57– 78° S, depth 567–810 m (O.S. Tattersall 1955; San Vicente 2010)</p><p>– A. arianii sp. nov. from the western Southern Ocean: Bellingshausen Sea, Drake Passage, South Sandwich Trench, Weddell Sea, Cape Basin, 41– 63° S, 9° E – 64° W, depth 2092–4698 m</p><p>– A. australiensis Murano, 2012 from the E Indian Ocean: Sahul Shelf, Timor Sea, 13° S, 123° E, depth 535–547 m (Murano 2012)</p><p>– A. bipapillatus sp. nov. from the western Southern Ocean: Weddell Slope, Powell Basin, 62– 71° S, 15– 47° W, depth 1182–3103 m</p><p>– A. durbani O.S. Tattersall, 1955 from the SW Indian Ocean: off Durban, SE Africa, 29° S, 32° E, depth ≤ 416 m (O.S. Tattersall 1955; Mauchline &amp; Murano 1977)</p><p>– A. ewingi Băcescu, 1967 from widely separated localities in the Pacific: off Japan, Peru Trench, 8° S – 42° N, 80° W – 144° E, depth 1997–2519 m (Mauchline &amp; Murano 1977; Fukuoka 2009)</p><p>– A. izuensis Murano, 2012 from the NW Pacific: Sagami Bay, central Japan, about 35° N, 139° E, depth 1685–1708 m (Murano 2012)</p><p>– A. kashimensis Murano, 2012 from the NW Pacific: Kashima Sea, central Japan, detailed coordinates and depth unknown (Murano 2012)</p><p>– A. kempi (Holt &amp; Tattersall, 1905) from the N Atlantic: Bay of Biscay, W Ireland, Iceland Basin, Canadian Atlantic, 44– 65° N, 6– 58° W, depth 200–1464 m (Wright 1973; Anadón 1993; Vanquickelberghe 2004; Astthorsson &amp; Brattegard 2022)</p><p>– A. longisquamosus Murano &amp; Mauchline, 1999 from the NE Atlantic: Rockall Trough, 57° N, 10° W, depth 1500–1809 m (Murano &amp; Mauchline 1999)</p><p>– A. magnus Birstein &amp; Tchindonova, 1958 from the N Pacific: Kurile-Kamtchatka Trench, Japan Trench, Mariana Trench, 11– 49° N, 141– 159° E, depth 4480–7260 m (Birstein &amp; Tchindonova 1958; Fukuoka 2009; Kou et al. 2018)</p><p>– A. manazuruensis Murano, 2012 from the NW Pacific: Sagami Bay, central Japan, 35° N, 139° E, depth 360–460 m (Murano 2012)</p><p>– A. okinawensis Murano, 2012 from the NW Pacific: NE of Okinawa Island, SW Japan, 27° N, 129° E, depth 870–945 m (Murano, 2012)</p><p>– A. pacificus Murano, 2012 with a wide range in the N Pacific, 39– 57° N, 155° E – 131° W, depth 180–1543 m (Murano 2012; as A. abbreviata in Banner 1948 a, Birstein &amp; Tchindonova 1958 and Petryashov 2005)</p><p>– A. sagamiensis Murano, 2012, from the NW Pacific: Sagami Bay, central Japan, 35° N, 139° E, depth ≤ 1000 m (Murano 2012)</p><p>– A. spiniferus Nouvel &amp; Lagardère, 1976 from the NE Atlantic: Bay of Biscay, Iceland Basin, 43– 63° N, 2– 27° W, depth 280–1500 m (Nouvel &amp; Lagardère 1976; Meland &amp; Brattegard 2007; Frutos &amp; Sorbe 2013; San Vicente et al. 2013)</p><p>– A. surugensis Murano, 2012 from the NW Pacific: Izu Peninsula, central Japan, about 35° N, 139° E, depth 1770–1780 m (Murano 2012)</p><p>– A. tattersalli Zimmer, 1914 is circum-Antarctic, 41– 78° S, depth 385–4931 m (Price 2001; Dewicke 2002; San Vicente et al. 2013; Wittmann 2020; Astthorsson &amp; Brattegard 2022)</p><p>– A. tenuicauda W.M. Tattersall, 1911 from the E Atlantic: Angola Basin, Bay of Biscay, W Ireland, Iceland Basin, 22° S – 63° N, 5° E – 22° W, depth 450–5433 m (Price 2001; Dewicke 2002; San Vicente et al. 2013; Wittmann 2020; Astthorsson &amp; Brattegard 2022)</p><p>– A. timorensis Murano, 2012 from the E Indian Ocean: Timor Sea, 10° S, 128° E, depth 465–490 m (Murano 2012)</p><p>– A. trisetosus Nouvel &amp; Lagardère, 1976 from the NE Atlantic: Bay of Biscay, Iceland Basin, 44– 62° N, 2– 17° W, depth 680–2300 m (Nouvel &amp; Lagardère 1976; Meland &amp; Brattegard 2007; San Vicente et al. 2013)</p></div>	https://treatment.plazi.org/id/EF7B8639FFC7FFA8FDE9010BFE0721DB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFCAFFAEFDF1056EFB4B2032.text	EF7B8639FFCAFFAEFDF1056EFB4B2032.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyops tattersalli Zimmer 1914	<div><p>Amblyops tattersalli Zimmer, 1914</p><p>Figs 11–13</p><p>Amblyops tattersalli Zimmer, 1914: 390–391, pl. xxiii figs 13–16 (coast of E Antarctica).</p><p>Amblyops tattersalli – W.M. Tattersall 1923: 275, 277, 285 (short description, record, Ross Sea). — O.S. Tattersall 1965: 15–16, figs 1–4 (description, record, Ross Sea). — Birstein &amp; Tchindonova 1970: 284–285 (in species list). — Ariani et al. 1993: table 1 (mineral composition of statoliths). — Wittmann 1995: fig. 1 (reproductive adaptations). — Brandt et al. 1998: table 1 (biogeography, endemism). — Petryashov 2006: 1409, fig. 5 (distribution, in key). — San Vicente et al. 2006: table 2 (biodiversity, new records, Southern Ocean). — San Vicente 2010: 42, table 4, fig. 35 (distribution, diagnosis, in key). — Murano 2012: 84 (in key). — Petryashov 2014a: 150, map 10 (biogeography). — Wittmann &amp; Ariani 2019: suppl. (fluorite statoliths, biogeography). — Mees &amp; Meland 2024: Aphia-ID 227029 (accepted).</p><p>Diagnosis</p><p>Based on adults of both sexes. All features within limits of generic diagnosis. Carapace with rounded, obtusely angled anterior margin. Eye rudiments without visual elements, roughly trapeziform with widely rounded lateral margin and with roughly linear, oblique anterior margin. Ocular papilla with ¼–⅓ of antero-posterior extension of eye rudiments. Disto-lateral edge of antennal sympod with only one large tooth. Antennal scale length 2.6–3.2 times maximum width. Scale extends 0.4–0.6 times its length beyond antennular trunk. Scale with small apical segment; bare portion of lateral margin ending at 9/10 of scale length in a large tooth, mesially tightly accompanied by 2–3 small spines. Setose terminal lobe of scale well projecting beyond large tooth. Mouthparts normal, labrum rostrally rounded. Thoracic exopod 1 with 9-segmented flagellum, exopods 2–8 with 10-segmented flagellum. Endopods 3–8 with unsegmented carpus separated from propodus by a strongly oblique articulation, two segments of propodus separated by a less oblique articulation. Female with three pairs of oostegites contributing to wall of marsupium. Male pleopods 1–5 biramous; endopods with 1, 18, 16–17, 16 and 15–16 segments, exopods with 17, 17, 17–18, 18 and 18 segments, respectively. Pleopods of both sexes with normal setae only. Both rami of uropods undivided, setose all around, endopod with one spine on mesial margin below statocyst. Telson linguiform, distal ⅔ with weakly converging, slightly sigmoid lateral margins and with broad, slightly flattened, convex terminal margin, disto-lateral edges rounded; length 1.7–1.9 times maximum width. Proximal ⅖ of telson with bare lateral margins, distal ⅗ of each lateral margin with dense series of 18–23 normal-shaped spines discontinuously increasing in length distally. Terminal margin with pair of paramedian setae tightly flanked by a pair of small spines, in turn flanked by 2–3 pairs of large spines, the latter forming a continuous series and gradually changing in length with proximally adjoining lateral spines; innermost large spine ⅑–⅙ of telson length. Telson with total of 42–54 spines plus two barbed setae.</p><p>Material examined</p><p>SE ATLANTIC • 1 ♂ subad. (BL = 16.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=9.914667&amp;materialsCitation.latitude=-41.11767" title="Search Plazi for locations around (long 9.914667/lat -41.11767)">Cape Basin</a>, ANDEEP-III station 016-10; 41°07.06ʹ S, 9°54.88ʹ E to 41°06.99ʹ S, 9°54.75ʹ E; depth 4687– 4669 m; 26 Jan. 2005; EBS epinet.</p><p>SOUTHERN OCEAN • 1 juv. (BL = 7.7 mm); NW Weddell Sea, ANDEEP-II station 131-3; 65°19.83ʹ S, 51°31.62ʹ W to 65°19.95ʹ S, 51°31.41ʹ W; depth 3049–3050 m; 5 Mar. 2002; EBS supranet • 1 ♀ ad. (fragmented, BL ≈ 27.3 mm, bearing nauplioid larvae), 1 ♂ ad. (BL = 22.7 mm), 3 juv.; NW Weddell Sea, ANDEEP-II station 133-3; 65°20.15ʹ S, 54°14.35ʹ W to 65°20.06ʹ S, 54°14.51ʹ W; depth 1122– 1119 m; 7 Mar. 2002; EBS epinet • 1 imm. (BL = 8.7 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-20.465&amp;materialsCitation.latitude=-68.061" title="Search Plazi for locations around (long -20.465/lat -68.061)">Weddell Abyssal Plain</a>, ANDEEP-III station 088-8; 68°03.66ʹ S, 20°27.90ʹ W to 68°03.61ʹ S, 20°27.52ʹ W; depth 4929–4931 m; 27 Feb. 2005; EBS supranet • 1 juv. (BL = 6.2 mm); Weddell Abyssal Plain, ANDEEP-III station 102-13; 65°34.32ʹ S, 36°31.32ʹ W to 65°34.40ʹ S, 36°31.07ʹ W; depth 4805– 4803 m; 6 Mar. 2005; EBS supranet • 2 ♂♂ ad. (BL = 24.6, 27.7 mm), 1 ♀ subad. (BL = 17.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.058334&amp;materialsCitation.latitude=-62.774834" title="Search Plazi for locations around (long -53.058334/lat -62.774834)">Powell Basin</a>, ANDEEP-III station 133-2; 62°46.49ʹ S, 53°03.50ʹ W to 62°46.38ʹ S, 53°03.98ʹ W; depth 1584– 1579 m; 16 Mar. 2005; EBS epinet • 1 ♂ ad. (BL = 22.8 mm, on slides); same collection data as for preceding • 1 ♀ subad. (BL = 11.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.134&amp;materialsCitation.latitude=-61.757" title="Search Plazi for locations around (long -47.134/lat -61.757)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 151-7; 61°45.52ʹ S, 47°07.68ʹ W to 61°45.42ʹ S, 47°08.04ʹ W; depth 1182–1185 m; 21 Mar. 2005; EBS epinet • 1 imm. (BL = 6.5 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.7425&amp;materialsCitation.latitude=-61.725666" title="Search Plazi for locations around (long -60.7425/lat -61.725666)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 114-4; 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W; depth 2914–2920 m; 18 Feb. 2002; EBS epinet • 1 ♀ ad. (BL = 20.9 mm), 1 imm., 1 juv.; same collection data as for preceding except for occurrence in supranet • 1 juv. (BL = 4.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.015833&amp;materialsCitation.latitude=-58.4155" title="Search Plazi for locations around (long -25.015833/lat -58.4155)">South Sandwich Trench</a>, E of Montagu Island, ANDEEP-II station 141-10; 58°25.08ʹ S, 25°00.77ʹ W to 58°24.93ʹ S, 25°00.95ʹ W; depth 2313– 2281 m; 23 Mar. 2002; EBS supranet .</p><p>Supplementary description</p><p>All features within the limits of the above diagnosis.</p><p>CARAPACE (Figs 11A–B, 13B). Anterior margin convex, posterior margin weakly concave. Median pore group 6% of carapace length in front of posterior margin. This group is constituted by eight (2 ×4) pores flanking a larger pore-like structure, together in M-like arrangement (Fig. 13B).</p><p>EYES (Fig. 11A–E). Eye rudiments dorsoventrally compressed by a factor of 1.5–1.9 measured near center. Eye surface mostly hispid by minute, slender triangular scales (Fig. 11C–D); on average largest scales (Fig. 11C) in median portions of anterior margin. Dorsal face covered only partly by somewhat shorter scales (Fig. 11D) scattered over surface, for methodological reasons best visible along accidental folds produced by forcing eye rudiments into a plane. Each eye with large, distally broadly rounded ocular papilla (Fig. 11B, E) closely behind anterior margin at ⅓ of eye width from mesial margin. Papilla ends in a toroid with central pore. Organ of Bellonci near papilla.</p><p>ANTENNAE S. LAT. (Figs 11F–G, 13A). Basal segment of antennula dorsally with striated sensory cushion well visible at bottom of an almost empty antennular bursa (Fig. 11F); such striation not visible in a bursa filled with extraneous material (Fig. 11G). Terminal segment of antennular trunk without female lobe. Disto-median lobe of trunk armed with four teeth increasing in size laterally, lobe disto-laterally with four barbed setae. The 2–3 tooth-like structures mesially adjoining disto-lateral tooth of antennal scale show a clear basal articulation (Fig. 13A) and thus represent true spines (or spiniform setae), as already concluded by W.M. Tattersall (1923), but not representing the “secondary denticles” [translation] indicated by Zimmer (1914) in the original description of this species.</p><p>MANDIBLES. Compared with left mandible (as in Fig. 21C–D), right mandible (as in Fig. 21E) bears smaller, serrate digitus mobilis and more strongly tooth-like spines of pars centralis.</p><p>GUT (Fig. 12). Similar to that of A. bipapillatus sp. nov. (Fig. 22). Dissected adult male of A. tattersalli differs from this species by presence of small denticles on distal fourth of apically coronate spines (Fig. 12B), posterior part of lateralia on each side with cluster of fewer (eight vs eleven) unilaterally serrated spines rather than with stiff bristles (Fig. 12D), and by dorsolateral infoldings on each side with cluster of fewer (five vs six) spines, more homogeneous in length (Fig. 12E). Lateral setae of superomedianum are basally much thicker (Fig. 12F) than slender normal setae in caudal position. All setae of superomedianum distally microserrated. Storage volume poorly filled with crustacean remains (mainly setae), a few very large mineral particles and very little masticated material. Midgut almost empty. Anal lobe distinct, weakly cuticularized (dashed line in Fig. 13C).</p><p>THORAX. Basal plate of exopods 1–8 with minute knob at subrectangular disto-lateral edge. Dactylus of endopod 2 not reflexed; oriented about perpendicular to carpopropodus. Endopods 3–8 long and slender. Endopod 8 when stretched reaches anteriorly to tip of antennal scale, posteriorly to end of pleomere 6. Penes with ⅘ length of ischium 8.</p><p>PLEON. Length of pleomeres 1–5 is 0.6–0.7, 0.6, 0.5, 0.5–0.7 and 0.5–0.6 times length of pleomere 6, respectively, telson 1.1–1.2 times length of pleomere 6. Pleomere 6 shorter than combined pleomeres 4–5. Female pleopods increasing in length caudally. Exopods of male pleopods 1–5 subequal in length. Scutellum paracaudale triangular with narrowly blunt apex.</p><p>TAIL FAN (Fig. 13C–F). Exopod of uropods 1.5 times endopod length and 1.5–1.7 that of telson; endopod 0.9–1.0 length of telson. Exopod extends 0.3–0.4 times its length beyond endopod and 0.4–0.6 beyond telson. Statoliths composed of fluorite, diameter 0.18–0.29 mm (n = 5). Telson dissected in two specimens: both spines flanking pair of paramedian setae minute (0.05 mm) in adult male with BL 22.8 mm (Fig. 13F); only right paramedian spine that small in adult female with BL 27.8 mm, left spine five times that size, i.e., one third of adjacent large spine. Telson with a pair of paramedian subbasal fields (visualized as shadowed areas in Fig. 13C) with 68–83 pores (n = 4; not all pores in focus in Fig. 13D). Telson with 2–3 µm long triangular scales organized in groups of up to twenty, mostly about ten scales (Fig. 13E); groups together forming narrow longitudinal ribbon proceeding close to each lateral margin between ⅕ and ⅘ telson length from basis (visualized as shadowed lateral areas in Fig. 13C).</p><p>NAUPLIOID LARVAE (Fig. 13G–I). Female with BL 27.3 mm carried 15 nauplioid larvae at substage N3. Body length of larvae 4.0– 4.6 mm. Nauplioid abdomen ends in furcal appendages, each armed with a fan of 18–22 spine-setae increasing in length distally (n = 5; Fig. 13I). Tip of larval antennula with 9–12 mostly shorter spine-setae, not arranged in series (n = 5; Fig. 13H). Remaining parts of body with smooth cuticle. Remaining features in Fig. 13G–I typical of stage of development.</p><p>Type locality and distribution</p><p>The type locality is the winter station (= Gauss Station) of the Deutsche Südpolar-Expedition 1901– 1903, coast of East Antarctica, 66°02ʹ S, 89°38ʹ E, depth 385 m. This circum-Antarctic species was reported by Petryashov (2006, 2014a) from 55– 78° S, depth 510–860 m and by San Vicente (2010) from 66– 75° S, depth 385– 547 m. The ANDEEP records are from Cape Basin, Weddell Abyssal Plain, NW Weddell Sea, Powell Basin, South Sandwich Trench and Drake Passage in the range of 41– 68° S, 10° E – 61° W, depth 1119–4931 m, thus representing strong latitudinal and bathymetric range extensions. Resulting total ranges 41– 78° S, 90° E anticlockwise to 61° W, depth 385–4931 m.</p></div>	https://treatment.plazi.org/id/EF7B8639FFCAFFAEFDF1056EFB4B2032	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFCFFF99FD3B0251FC0D20BD.text	EF7B8639FFCFFF99FD3B0251FC0D20BD.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyops arianii Wittmann 2024	<div><p>Amblyops arianii sp. nov.</p><p>urn:lsid:zoobank.org:act: 255ECB18-09AF-4B64-9C92-1CD618131C02</p><p>Figs 14–19</p><p>Diagnosis</p><p>Based on adult and subadult females. Fitting within ranges of generic diagnosis. Carapace with broadly rounded, obtuse-angled, uptilted anterior margin. Uptilted portion half as long as terminal segment of antennular trunk, covering part of eye rudiments. Eye rudiments without visual elements, subovate, converging at mesial third; all around hispid by scales. Ocular papilla with ⅕–¼ of antero-posterior extension of eye rudiments. Antennal sympod disto-laterally with large dorsal and large ventral tooth, plus distally blunt, triangular projection. Antennal scale with short apical segment, total scale length 2.6–2.8 times maximum width. Scale extends 0.5–0.6 times its length beyond antennular trunk. Setose terminal lobe of scale very short, not reaching tip of disto-lateral tooth; no accessory spines beneath this tooth. Mouthparts normal, labrum rostrally rounded. Female with three pairs of oostegites contributing to outer wall of marsupium. Endopod of uropods with one minute spine on mesial margin below statocyst. Telson about trapeziform with transversely flattened, convex terminal margin; length 1.9 times maximum width. Telson proximally with bare lateral margins, distal ⅖–⅗ of each lateral margin with dense series of 9–11 normal-shaped spines distally gradually increasing in size; terminal margin with pair of paramedian setae flanked by 2–3 pairs of large spines with mesially increasing size, innermost large spines only ≈ 1/17 of telson length, no minute median spines. Telson with total of 22–28 spines and two setae.</p><p>Etymology</p><p>The species name is a noun with Latinized masculine ending in genitive singular, dedicated to Antonio P. Ariani (Univ. Naples) in recognition of his important contributions to the taxonomy, biogeography and biomineralogy of mysids.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ ad. (BL = 25.8 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS supranet; ZMH 64653.</p><p>Paratypes SOUTHERN OCEAN • 1 ♀ subad. (BL = 24.2 mm, on slides); same collection data as for holotype; ZMH 64655 • 1 ♀ imm. (damaged, BL = 20.7 mm), 1 juv. (damaged, BL = 7.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.587833&amp;materialsCitation.latitude=-59.673668" title="Search Plazi for locations around (long -57.587833/lat -59.673668)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 042-2; 59°40.29ʹ S, 57°35.43ʹ W to 59°40.42ʹ S, 57°35.27ʹ W; depth 3683– 3680 m; 27 Jan. 2002; EBS supranet; ZMH 64654 • 1 imm. (BL = 16.5 mm, in 2 parts); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-0.0365&amp;materialsCitation.latitude=-67.4935" title="Search Plazi for locations around (long -0.0365/lat -67.4935)">eastern Weddell Abyssal Plain</a>, S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 0°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet; ZMH 64657 • 1 imm. (BL = 18.0 mm, in 2 parts); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-43.036&amp;materialsCitation.latitude=-65.01133" title="Search Plazi for locations around (long -43.036/lat -65.01133)">Weddell Abyssal Plain</a>, ANDEEP-III station 110-8; 65°00.52ʹ S, 43°02.09ʹ W to 65°00.68ʹ S, 43°02.16ʹ W; depth 4698– 4696 m; 10 Mar. 2005; EBS supranet; ZMH 64658 • 1 ♀ ad. (damaged, BL = 21.8 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-24.349&amp;materialsCitation.latitude=-58.236332" title="Search Plazi for locations around (long -24.349/lat -58.236332)">South Sandwich Trench</a>, E of Montagu Island, ANDEEP-II station 139-6; 58°14.10ʹ S, 24°21.22ʹ W to 58°14.18ʹ S, 24°20.94ʹ W; depth 3941.7– 3926.8 m; 20 Mar. 2002; EBS supranet; ZMH 64656 .</p><p>Other material</p><p>SE ATLANTIC • 1 imm. (BL = 8.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=9.914667&amp;materialsCitation.latitude=-41.11767" title="Search Plazi for locations around (long 9.914667/lat -41.11767)">Cape Basin</a>, ANDEEP-III station 016-10; 41°07.06ʹ S, 9°54.88ʹ E to 41°06.99ʹ S, 9°54.75ʹ E; depth 4687– 4669 m; 26 Jan. 2005; EBS epinet .</p><p>SOUTHERN OCEAN • 1 ♀ subad. (damaged, BL ≈ 13.9 mm); SE Weddell Sea, ANDEEP-III station 074-6; 71°18.35ʹ S, 13°57.71ʹ W to 71°18.28ʹ S, 13°57.31ʹ W; depth 1030–1040 m; 20 Feb. 2005; EBS epinet.</p><p>Type locality and distribution</p><p>The type locality is ANDEEP I station 046-7: Drake Passage, South Shetland area, NE of Elephant Island, 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W, depth 2893.6– 2893.2 m. This species is widely distributed in the western Southern Ocean: Bellingshausen Sea, Drake Passage, South Sandwich Trench and Weddell Sea. It was also found in the single sample from the SE Atlantic: Cape Basin. Total range 41– 63° S, 9° E anticlockwise to 64° W, depth 2092–4698 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features visible without dissection are within limits of specific diagnosis. Adult female with BL 25.8 mm. Cephalothorax contributes 45%, pleon (without telson) 40% and telson 14% to total BL.</p><p>CARAPACE (Fig. 14C, G). Normal, length 44% of BL, cervical sulcus strong, cardial sulcus weak. Disto-lateral edges about rectangular, distally narrowly rounded. Concave posterior margin of carapace leaving ultimate thoracomere only marginally dorsally exposed.</p><p>EYES (Fig. 15). Eye rudiments dorsoventrally compressed by a factor of 1.7–1.8. Rostral projection ending in a single triangular ocular papilla at one third of eye width from mesial margin (Fig. 15C). Antero-posterior extension of eyes 0.7 of maximum width (= transverse extension) and 1.2 times length of terminal segment of antennular trunk. Spiniform scales covering eyes also extend over papilla (Fig. 15D). Papilla ends in a toroid with pore in center. Organ of Bellonci near mesio-basal edge of eye.</p><p>ANTENNULA (Fig. 16A). Trunk measures 9% of BL. It extends ⅘ of its length beyond eyes. Roughly transverse articulations between three segments of trunk. Measured along dorsal midline, basal segment 0.4 of trunk length, median 0.2 and terminal 0.4. Length of basal segment 0.7 times width; segment dorsally with antennular bursa, no ventral carina. This segment produced into a short lobe at disto-lateral edge, lobe apically with five setae. Two setose dorsal apophyses (dashed lines in Fig. 16A) shortly extending beyond its rostral margin. Median segment also with two setose dorsal apophyses. Length of terminal segment 0.8 times width in dorsal view, 0.7 in ventral view. Terminal segment without female lobe. Disto-median lobe of terminal segment armed with three small teeth increasing in size laterally, lobe disto-laterally with four barbed setae (as in Fig. 4B). Width of outer antennular flagellum measured near basis 1.2 times width of inner flagellum.</p><p>ANTENNA (Fig. 16C). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Segments 1–4 of peduncle contribute 26%, 13%, 25% and 36% to total length in dorsal view, vs 27%, 31%, 18% and 24% in ventral view, respectively. Differences between dorsal and ventral views mainly due to lengthwise oblique border between second segment and dorsally overlapping third segment.</p><p>CEPHALOTHORAX. Clypeus (Fig. 16B) with low longitudinal ridge marginally extending beyond frontal lobe. Mouthparts essentially as in other species of Amblyops treated here. Thoracic endopods 1–2 with six segments (Fig. 18A, C), dactylus with slender nail (Fig. 18B, D). Dactylus of endopod 2 not reflexed (Fig. 18C–D). Thoracic exopod 1 with nine segments, exopod 2 with 9–10 and exopods 3–8 with ten.</p><p>PLEON AND TAIL FAN (Fig. 19). Length of pleomeres 1–5 is 0.6, 0.5, 0.5, 0.5 and 0.6 times length of pleomere 6, respectively. Pleopods increase in length caudally. Scutellum paracaudale large, sinusoid. Uropods with smooth cuticle, not considering setae and single spine of endopod. Exopod with convex mesial margin; its terminus broadly rounded, convex. Exopod 1.2–1.4 times as long as endopod and 1.6–1.8 times as long as telson; endopod 1.2–1.4 times as long as telson. Margins of endopod converge in narrow V-shaped manner up to blunt apex. Telson length 1.2 times as long as ultimate pleomere; width at terminus (measured between lateral margins of latero-terminal spines) is 23% of maximum width and 12% of telson length.</p><p>Paratypes</p><p>Covers features requiring dissection. Uptilted portion of carapace (Fig. 14C) on each side with transverse field of about 80–90 pores (only few pores visualized in Fig. 14D). No pores detected (though not excluded) near posterior margin of carapace.</p><p>MANDIBLES (Fig. 16D–F). Basal segment of palp contributes 14–16%, median segment 61–64% and apical segment 21–23% to total palp length. Median segment 2.3–2.6 times as long as wide, mesial and lateral margins convex, lateral margin folded mesially. Length of apical segment 2.6–2.9 times maximum width. Palp not hispid, its basal segment without setae, median segment strongly setose along mesial margin and less strongly along lateral margin, apical segment densely setose along mesial margin and with only few short setae along lateral margin. Distal half of median segment in addition with linear series of setae along midline of caudal face. Masticatory part of right mandible (Fig. 16E): pars incisiva with four large plus one medium-sized tooth; digitus mobilis with two large teeth, each serrated by series of small secondary teeth. Pars centralis with ten acute spines in dense series, continuously decreasing in size proximally: two largest, most ventral (= aboral) spines serrated by small denticles, remaining spines armed with stiff bristles. Processus molaris of right mandible and complete masticatory part of more normal left mandible (Fig. 16F) as in A. bipapillatus sp. nov. (Fig. 21C–E).</p><p>GUT (Fig. 17). Foregut with normal gross structure. Anterior part of lateralia with many distally all around strongly dentate spines (Fig. 17B). Long slender spines cactus-like along distal 6–10% (Fig. 17B 2), shorter, less slender spines prickly along distal ¼–½ (Fig. 17B 1). Anterior part of lateralia in addition with fewer slender, proximally smooth, subapically sparsely dentate and apically coronate spines (Fig. 17B 3). Central part of lateralia with slender, apically pronged spines (Fig. 17C) densely coated with minute teeth along about distal half of shaft. Posterior part of lateralia on each side with dense cluster of ten strongly dentate spines (Fig. 17D). Dorsolateral infoldings on each side with cluster of five spines increasing in size laterally, these spines unilaterally serrated along most of distal third to half (Fig. 17E). All setae of superomedianum slender and distally microserrated; lateral setae (Fig. 17F) longer than caudal setae. Storage volume almost empty in dissected specimen. Sparse presence of unidentifiable organic materials (detritus) and small mineral particles in both foregut and midgut. Anal lobe caudally strongly cuticularized (dashed lines in Fig. 19D).</p><p>MAXILLULA (Fig. 16G). Distal segment with eleven strong spines on transverse terminal margin, these spines unilaterally serrated mostly along median portions. This segment subterminally with four setae bearing long stiff barbs; no nearby pores detected. Endite of maxillula terminally with six large, distally spiny setae, on both sides accompanied by numerous less strongly barbed setae. Most proximal seta backward curved.</p><p>MAXILLA (Figs 14F, 16H). Sympod with three mesial lobes, densely setose along disto-mesial margins. Convex mesial portion of sympod may be interpreted as additional lobe bearing large, dense fan of setae. One large seta extends shortly beyond this fan, on caudal face, at margin near distally neighboring lobe; this seta apically and subapically with series of short, stiff barbs. Exopod of maxilla reaches to terminal margin of basal segment of palp. Exopod with dense series of plumose setae all along lateral margin; largest seta (dashed line in Fig. 16H) at tip of exopod. Mesial margin bare except for one subapical seta. Ribbon of triangular scales all along lateral margin, on distal half constituted by series of about 5–10 µm long scales, each accompanied by mostly only one small, 2–5 µm long scale, on proximal half with higher incidence of small triangular scales. Basal sinus of exopod with triangular scales together with slender, bristle-like scales (Fig. 14F). The smaller and more slender scales are, the more they tend to occur in clusters of 3–8 scales. Maxillary palp with distal segment contributing ⅗ of palp length. This segment two times as long as maximum width, densely setose all along distal ⅘, no spines. Mesial margin of proximal segment with three normal-shaped barbed setae (partly below drawing plane in Fig. 16H).</p><p>THORAX (Fig. 18). Sternite 1 with distally rounded median lobe as normal in Mysidae . One large, basally thick barbed seta closely accompanied by 6–8 smaller such setae (Fig. 18C) on intersegmental joint between sympod 2 and its sternite. Basal plate of exopods with smooth cuticle, length 1.8–2.0 times maximum width, plates with minute tooth-like projection on disto-lateral edge, projection unapparent in Fig. 18C due to its small size. Flagellum of exopod 2 with only nine segments in dissected subadult female (Fig. 18C) vs ten in adult holotype. Epipod 1 leaf-like, longer than combined ischium, merus and carpus of endopod 1; no seta (Fig. 18A). Endopods 1–2 and 8 available in subadults and immatures, remaining endopods broken. Endopods 1–2 with six segments (Fig. 18A, C), endopod 8 with eight segments counting from basis to dactylus (Fig. 18F). Thoracic endopod 8 with its three carpopropodus segments separated from each other by oblique articulations (Fig. 18F). Available endopods with smooth cuticle not counting setae; no pores detected. Coxa of endopod 1 (Fig. 18A) with small mesial lobe apically bearing one small barbed seta; basis with large, setose endite, remaining segments without clear endite. All available dactyli with slender, weakly curved acute nail; nail 8 short (Fig. 18G), nail 1 normal-sized (Fig. 18B), nail 2 longest (Fig. 18D); nails 1–2 microserrated along median to subapical portions of weakly concave mesial (= inner) margin (Fig. 18B, D–E), nail 8 smooth (Fig. 18G).</p><p>TAIL FAN (Figs 14E, 19C–E). Exopod of uropods extends 0.3–0.4 times its length beyond endopod and 0.4–0.6 times beyond telson. Statoliths composed of fluorite, diameter 0.12–0.28 mm (n = 4). Telson near basal margin with a pair of transverse pore fields flanking midline; each field with ≈100 pores with diameter &lt;2 µm as in Fig. 14D (&lt;100 pores visualized as dots in Fig. 19D). Telson with about 2 µm long triangular scales along most of its lateral margins. Scales organized in clusters of up to thirty (Fig. 14E). Together, clusters form narrow longitudinal ribbon (shaded areas in Fig. 19D) proceeding close to each lateral margin along 1/12–11/12 telson length from basis.</p></div>	https://treatment.plazi.org/id/EF7B8639FFCFFF99FD3B0251FC0D20BD	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFF8FF81FDD902CBFADA2538.text	EF7B8639FFF8FF81FDD902CBFADA2538.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyops bipapillatus Wittmann 2024	<div><p>Amblyops bipapillatus sp. nov.</p><p>urn:lsid:zoobank.org:act: D3C59570-163A-4707-A043-F889EA94456A</p><p>Figs 20–24</p><p>Diagnosis</p><p>Based on adult female. Fitting within ranges of generic diagnosis. Carapace with broadly rounded anterior margin. Eye rudiments with complex structure (Figs 20, 21A), no visual elements; eyes converging mesially, dorsoventrally compressed by a factor of 1.3–1.5. Each eye rudiment with two basally wide ocular papillae; length of distal papilla 28–31% of length of antero-posterior extension of eye rudiment, proximal papilla 21–26%. Distal papilla mid-rostrally forming part of anterior margin, and proximal papilla at distal third from mesial margin. Disto-lateral edge of antennal sympod produced into one large tooth. Antennal scale with setose mesial margin and bare lateral margin up to remaining, available scale length (apex broken). Mouthparts normal, labrum rostrally rounded. Thoracic exopod 1 with 9-segmented flagellum, exopods 4–8 with 10-segmented flagellum (exopods 2–3 broken). Three carpopropodus segments separated from each other by oblique articulations in thoracic endopods 5 and 8 (endopods 3–4 and 6–7 broken). Female with three pairs of oostegites contributing to outer wall of marsupium, first pair small but functional. Endopod of uropods with one minute spine on mesial margin below statocyst. Telson linguiform, distal half subtriangular with nearly continuously converging lateral margins, narrow terminal margin flattened; telson length 2.2 times maximum width. Lateral margins proximally bare, their distal 4/7 armed with 29–32 normal-shaped spines, distally gradually increasing in size; terminal margin with small median spine flanked by slightly subterminally inserting pair of setae, in turn flanked by two pairs of large spines, among which submedian spines largest, only ≈ 1/15 of telson length. Telson with total of ≈ 66 spines and two setae.</p><p>Etymology</p><p>The species name is an adjective with masculine ending, formed by amalgamation of the Classic Latin adverb ‘ bis ’ (‘twice’) with the adjective ‘ papillatus ’ (‘papillary’), referring to the pair of papillae on each eye rudiment (Fig. 20A–C).</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ ad. (BL = 16.7 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.723166&amp;materialsCitation.latitude=-70.65366" title="Search Plazi for locations around (long -14.723166/lat -70.65366)">eastern Weddell Slope</a>, Kapp Norvegia, ANDEEP-III station 080-9; 70°39.07ʹ S, 14°43.36ʹ W to 70°39.22ʹ S, 14°43.39ʹ W; depth 3103– 3102 m; 23 Feb. 2005; EBS epinet; ZMH 64659.</p><p>Other material</p><p>SOUTHERN OCEAN • 1 juv. (BL = 5.8 mm, in 2 parts); Powell Basin, SW continental slope of <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.134&amp;materialsCitation.latitude=-61.757" title="Search Plazi for locations around (long -47.134/lat -61.757)">South</a> Orkney Islands, ANDEEP-III station 151-7; 61°45.52ʹ S, 47°07.68ʹ W to 61°45.42ʹ S, 47°08.04ʹ W; depth 1182–1185 m; 21 Mar. 2005; EBS epinet .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP III station 080-9: eastern Weddell Slope, Kapp Norvegia, SW of Wegener Canyon, 70°39.07ʹ S, 14°43.36ʹ W to 70°39.22ʹ S, 14°43.39ʹ W, depth 3103– 3102 m. Also found in the Powell Basin. Total range 62– 71° S, 15– 47° W, depth 1182–3103 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features as in specific diagnosis. Adult female with empty marsupium, BL = 16.7 mm. Carapace measures 31% of BL, cephalothorax 36%, pleon without telson 48% and telson 16%. Small, distally rectangular subrostral process extends shortly beyond anterior margin of carapace. Clypeus with short median projection anteriorly, not reaching half-length of basal segment of antennular trunk (Fig. 21A).</p><p>CARAPACE (Figs 20E, 21A). Normal, cervical sulcus strong, no cardial sulcus visible; disto-lateral edges rounded; posterior margin concave, terminal indentation shallow, broadly rounded. Carapace leaves 1½ thoracomeres mid-dorsally exposed. No pores detected (though not excluded). Large parts of carapace indicated as shadowed areas in Fig. 21A covered by roughly ellipsoidal cuticular structures (Fig. 20E), representing minute depressions in part (accidentally) filled with external material.</p><p>EYES (Figs 20A–D, 21A). Antero-posterior extension of eye rudiments 0.8 of maximum width and about as long as terminal segment of antennular trunk. Organ of Bellonci near distal papilla. Rudiments with smooth cuticle all around except for pore at tip of ocular papillae and slender tooth-like scales (Fig. 20D) along mesially declining diagonal margin which separates thicker proximo-lateral portion from disto-mesial portion of eye rudiment; no other scales on eye rudiments.</p><p>ANTENNULA (Fig. 21A). Trunk measures 9% of BL. It extends ¾ of its length beyond eyes. Transverse articulation between three trunk segments. Measured along dorsal midline, basal segment 0.4 of trunk length, median 0.2 and terminal 0.4. Length of basal segment 0.7 times width. Basal segment produced in short lobe at disto-lateral edge, lobe apically with four setae; antennular bursa distinct, no ventral carina. Length of terminal segment 0.8 of width in dorsal view, 0.9 in ventral view. This segment with disto-median lobe armed with three small teeth increasing in size laterally, lobe disto-laterally with four barbed setae as in Fig. 4B; no female lobe, no callynophore (Fig. 21A). Width of outer antennular flagellum measured near basis about same as width of inner flagellum.</p><p>ANTENNA (Fig. 21A–B). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Segments 1–4 contribute 27%, 12%, 18% and 42% to total length of peduncle in dorsal view, vs 28%, 28%, 13% and 31% in ventral view, respectively. Differences between dorsal and ventral views mainly reflect strongly oblique border between second segment and dorsally overlapping third segment. Tip of antennal scale broken in both available specimens.</p><p>MANDIBLES (Fig. 21C–E). Basal segment of palp contributes 9–10%, median segment 64–66% and apical segment 25–26% to total palp length. Median segment 2.4–2.6 times as long as wide, mesial and lateral margins convex, lateral margin bent mesially (Fig. 21C). Length of apical segment 3–4 times maximum width. Palp not hispid, its basal segment without setae, median segment densely setose along lateral and mesial margins, apical segment densely setose along mesial margin and only sparsely setose along lateral margin. Masticatory part of right mandible (Fig. 21E): pars incisiva with four large teeth; digitus mobilis serrated by numerous small teeth over most of its mesial margin, its disto-mesial edge extended into one large tooth. Pars centralis with eight acute, smooth spines: most ventral (= aboral) spine very large, these spines set apart dorsally (orally) followed by dense series of one small and six intermediate-sized spines. Processus molaris folded ventrally, bearing strong grinding lamellae proximally ending in teeth and dense bundle of stiff bristles on distal margin including proximal edge. Masticatory part of left mandible (Fig. 21C–D): pars incisiva with four large and several small teeth; digitus mobilis with four large teeth, pars centralis with six slender spines armed with stiff bristles; processus molaris with short grinding lamellae proximally not ending in teeth and with dense cover of stiff bristles on proximal (= oral) edge.</p><p>GUT (Fig. 22). Foregut with normal gross structure. Lateralia with brushes of slender, proximally smooth, apically coronate spines (Fig. 22B) of various length and with slender, apically pronged spines (Fig. 22C), only latter type of spines densely coated with minute teeth along at least distal half of shaft. Posterior part of lateralia on each side with cluster of 11–12 spines armed with stiff bristles, peripheral spines larger than central spines (Fig. 22D). Dorsolateral infoldings on each side with cluster of two large spines at some distance mesially accompanied by 3–4 smaller spines, all these spines unilaterally serrated along distal third to half (Fig. 22E). Storage volume about half-filled with mainly masticated, unidentifiable organic materials (detritus) and abundant large mineral particles, plus remains of at least one copepod. Midgut with unidentified organic material and with many mineral particles, on average smaller than those of foregut. Anal lobe distinct (dashed lines in Fig. 24F), weakly cuticularized.</p><p>MAXILLULA (Fig. 21F). Distal segment with eleven strong spines on transverse terminal margin, these spines unilaterally serrated mostly along median portions. This segment subterminally with three setae bearing long stiff barbs; no nearby pores detected. Endite of maxillula terminally with three large, distally spiny setae, on both sides accompanied by numerous less strong setae. Most proximal seta backward curved.</p><p>MAXILLA (Fig. 21G). Sympod with three mesial lobes, densely setose along their disto-mesial margins. Convex mesial portion of sympod may be interpreted as additional lobe bearing large, dense fan of setae. One large seta extends shortly beyond this fan, on caudal face, at margin near distally neighboring lobe; this seta apically and subapically with unilateral series of short, stiff barbs. Exopod of maxilla just barely not reaching terminal margin of basal segment of palp. Exopod with dense series of plumose setae all along lateral margin; largest seta at tip of exopod. Mesial margin bare. Maxillary palp with distal segment contributing ⅗ of palp length. This segment two times as long as maximum width; segment densely setose all along distal ⅔, no spines. Mesial margin of proximal segment with three normal-shaped barbed setae (below drawing plane in Fig. 21G, therefore visualized by dashed lines).</p><p>THORAX (Fig. 23). Sternite 1 with distally rounded median lobe as normal in Mysidae . One large, basally thick, barbed seta closely accompanied by 2–4 smaller such setae (most parts below drawing plane, visualized by dashed lines in Fig. 23E) on intersegmental joint between sternites 4–7 and respective sympods (sternites 2–3 and 8 damaged). Exopods 1 and 4–8 available, remaining exopods broken. Available basal plates with smooth cuticle, length twice maximum width, plates with minute tooth-like distal projection on disto-lateral edge, projection unapparent in Fig. 23A due to its small size. Epipod 1 leaf-like, about as long as combined ischium and merus of endopod 1; no seta. Endopods 1–2, 5 and 8 available, remaining endopods broken. Available endopods with smooth cuticle, not counting setae; no pores detected. Coxa of endopod 1with small mesial lobe apically bearing one small barbed seta; basis with large, setose endite, remaining segments without clear endite. Endopods 1–2 with six segments (Fig. 23A, C), endopods 5 and 8 with eight segments counting from basis to dactylus (Fig. 23E). Dactylus of endopod 2 reflexed (Fig. 23C–D). All available dactyli with basally wide, weakly curved acute nail; nails 5 and 8 short (Fig. 23F, H), nail 1 normal-sized (Fig. 23B), nail 2 longest (Fig. 23D); nails 1–2 and 5 smooth (Fig. 23B, D, F), nail 8 microserrated along distal fourth of its convex lateral (= outer) margin (Fig. 23I). Serration of outer rather than inner margin appears exceptional in Mysidae .</p><p>PLEON (Fig. 24A–D). Length of pleomeres 1–5 is 0.6, 0.6, 0.5, 0.5 and 0.6 times length of pleomere 6, respectively. Pleopods increasing in length caudally. Scutellum paracaudale subtriangular with weakly convex margins and blunt apex.</p><p>TAIL FAN (Fig. 24E–H). Uropods with smooth cuticle, not considering setae and single spine. Margins of endopod converge in narrow V-shaped manner up to blunt apex. Exopod with almost straight lateral margin and convex mesial margin; its terminus broadly rounded, convex. Exopod measures 1.3 times endopod length and also 1.3 times that of telson; endopod about as long as telson. Exopod extends 0.3 times its length beyond endopod and 0.4 beyond more rostrally inserting telson. Statoliths composed of fluorite, diameter 10–11 µm, thickness 7–8 µm (n = 2). Telson length 1.3 times that of ultimate pleomere; width at terminus (measured between lateral margins of latero-terminal spines) is 12% of maximum width and 6% of telson length. Dorsal face of telson subbasally with paramedian fields with 34 and 37 pores, respectively (Fig. 24F–G), pore diameters &lt;3 µm. Telson with triangular scales organized in clusters as in Fig. 14E. Clusters together form narrow longitudinal ribbon (shaded lateral areas in Fig. 24F) proceeding close to each lateral margin between ⅙ and ⅚ of telson length from basis.</p></div>	https://treatment.plazi.org/id/EF7B8639FFF8FF81FDD902CBFADA2538	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFE0FF81FD34074DFD80209E.text	EF7B8639FFE0FF81FD34074DFD80209E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Desmocornea Wittmann 2024	<div><p>Desmocornea gen. nov.</p><p>urn:lsid:zoobank.org:act: 7A9D3ED7-5555-44F5-93E8-520164BEECE7</p><p>Type species</p><p>Desmocornea subchelata gen. et sp. nov. by monotypy and present designation.</p><p>Diagnosis</p><p>Based on adult female. Carapace normal. Bilobate eyes set laterally apart, not connected by membranous integument, no definite eyestalk. Adult eye with incomplete ommatidia (unlike in well-developed eye of juvenile). Lateral third of eyes occupied by lobe containing ommatidia in linear arrangement, together forming self-contained ribbon. Eye with one sensory papilla, no tooth-like non-sensory projection. Antennal peduncle 4-segmented with oblique border between second segment and dorsally overlapping third segment. Antennal scale with small apical segment; mesial margin setose, lateral margin all along bare, scale with large apical tooth; setose apical lobe not reaching tip of this tooth. Mouthparts normal, labrum rostrally rounded. Thoracomeres and pleomeres normal. Thoracic endopod 2 ending in subchela formed by reflexed, strongly elongate dactylus with claw facing carpopropodus. Female with three pairs of well-developed oostegites. Female pleopods reduced to uniramous setose plates with pseudobranchial lobe. Both rami of uropods unsegmented, setose all around. Lateral margins of telson converging laterally, not serrated; no lateral constriction, no terminal incision; lateral margins and transverse terminal margin with spines.</p><p>Etymology</p><p>The genus name is a noun with feminine ending, formed by fusion of the Classic Greek ‘δεσμός’ (‘ribbon’) with the morphological term ‘cornea’ referring to the cornea of the lateral eye lobe forming a self-contained ribbon (Fig. 27B).</p></div>	https://treatment.plazi.org/id/EF7B8639FFE0FF81FD34074DFD80209E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFE0FF8BFD9C02AAFC6C2562.text	EF7B8639FFE0FF8BFD9C02AAFC6C2562.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Desmocornea subchelata Wittmann 2024	<div><p>Desmocornea subchelata gen. et sp. nov.</p><p>urn:lsid:zoobank.org:act: 3B26DF92-6C03-4CC6-A5FE-0097382D8D57</p><p>Figs 25–30</p><p>Diagnosis</p><p>Based on adult female. All features as in generic diagnosis. Eyes bilobate, differentiated in a bulbous, dorsoventrally flattened mesial lobe and a smaller, roughly calotte-shaped lateral lobe. Eyestalk fused only with mesial lobe. Reduced ommatidia of mesial lobe face centripetally; modified, in some way functional ommatidia of lateral lobe face laterally, tightly set in parallel orientation, together forming self-contained ribbon. One large tooth close to acute disto-lateral edge of antennal sympod. Antennal scale extends 0.6 times its length beyond antennular trunk and 0.3–0.4 times beyond antennal peduncle. Total scale length three times maximum width; its disto-lateral tooth mesially closely accompanied by two short spines. Thoracic exopod 1 with 9-segmented flagellum, exopods 2, 5–6 and 8 with 10-segmented flagellum (exopods 3–4 and 7 broken). Carpopropodus 2 weakly elongate, longer than merus; reflexed dactylus strongly elongate,&gt; 4 times as long as wide, claw stout and short, ⅖ as long as dactylus. Endopod of uropods with one small slender spine close to mesial margin below statocyst. Telson trapeziform, length 1.7 times maximum width; distal half with continuously converging lateral margins. Proximal 45% of lateral margins without spines, distally remaining portion with about 13–14 normal-shaped spines increasing in length caudally. Transversely truncate terminal margin with very shallow median indentation lined with pair of setae flanked by pair of minute spines; indentation in turn flanked by two pairs of large latero-terminal spines, submedian spines largest, measuring about ¼ of telson length. Telson with total of ≈33 spines and two setae.</p><p>Etymology</p><p>The species name is a Latinized adjective with feminine ending, referring to the subchelate second thoracic endopod.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ ad. (BL = 18.5 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-64.61967&amp;materialsCitation.latitude=-63.319168" title="Search Plazi for locations around (long -64.61967/lat -63.319168)">Bellingshausen Sea</a>, NW of Anvers Island, ANDEEP-III station 153-7; 63°19.31ʹ S, 64°36.94ʹ W to 63°19.15ʹ S, 64°37.18ʹ W; depth 2092–2118 m; 29 Mar. 2005; EBS supranet; ZMH 64679.</p><p>Paratypes SOUTHERN OCEAN • 1 ♂ imm. (most thoracopods and pleopods broken, BL ≈ 9.7 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.134&amp;materialsCitation.latitude=-61.757" title="Search Plazi for locations around (long -47.134/lat -61.757)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 151-7; 61°45.52ʹ S, 47°07.68ʹ W to 61°45.42ʹ S, 47°08.04ʹ W; depth 1182–1185 m; 21 Mar. 2005; EBS supranet; ZMH 64681 • 1 juv. (damaged, BL = 5.3 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-24.897833&amp;materialsCitation.latitude=-58.268833" title="Search Plazi for locations around (long -24.897833/lat -58.268833)">South Sandwich Trench</a>, E of Montagu Island, ANDEEP-II station 140-8; 58°15.98ʹ S, 24°53.72ʹ W to 58°16.13ʹ S, 24°53.87ʹ W; depth 2947–2970 m; 22 Mar. 2002; EBS supranet; ZMH 64680 .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP III station 153-7: Bellingshausen Sea, NW of Anvers Island, 63°19.31ʹ S, 64°36.94ʹ W to 63°19.15ʹ S, 64°37.18ʹ W, depth 2092–2118 m. Also recorded from South Sandwich Trench, E of Montagu Island and from the Powell Basin. Total ranges 58– 63° S, 25– 65° W, depth 1182–2970 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features as in specific diagnosis. Adult female with empty marsupium, BL = 18.5 mm, completely dissected. Carapace measures 28% of BL, cephalothorax 34%, pleon without telson 54% and telson 12%. Clypeus with mid-ventral carina rostrally passing into distally rounded median projection reaching to median segment of antennular trunk.</p><p>CARAPACE (Figs 25E, 28A). With short, broadly rounded, uptilted anterior margin, rostrum indistinct (though distinct in juvenile). Uptilted portion of carapace as long as 9% of terminal segment of antennular trunk. Disto-lateral edges well-rounded; concave posterior margin leaving ultimate 1.5</p><p>thoracic segments dorsally exposed. Eight pores flanking a larger donut-like structure (Fig. 25E) in mid-sub-caudal position (arrows in Fig. 28A) on carapace.</p><p>EYES (Figs 25B, 26). Both eyes strictly symmetrical. Bilobate structure evident in loco (Fig. 26A), but lobate shape accidentally disappeared upon expansion on slides (Figs 26B, 27C). Lateral eye lobe with self-contained ribbon formed by parallel-oriented, laterally directed ommatidia (Fig. 26B) without rhabdom-like striation. Mesial eye lobe with few, throughout vestigial, mostly inconspicuous ommatidia (Fig. 26B) not reaching surface, no rhabdom detected. Antero-posterior extension of mesial eye lobe about equal to its maximum width and 0.8 times as long as terminal segment of antennular trunk; lobe dorsoventrally flattened by a factor of about 1.4 (Fig. 25B). Distally rounded subtriangular papilla positioned dorsally close to mesial margin of mesial eye lobe (Fig. 26B). Papilla measuring ⅕ of antero-posterior extension of mesial eye lobe. Papilla with terminal pore, no scales. Organ of Bellonci spherical, near papilla. Tooth-like scales, mostly 15–25 µm long, along anterior margin of mesial eye lobe (as in Fig. 27C) and along low ridge (emphasized by long arrow in Fig. 26B–C) associated with ocular papilla.</p><p>ANTENNULA (Fig. 28B–C). Trunk measures 9% of BL. It extends ⅔ of its length beyond eyes. Transverse articulation between three trunk segments. Measured along dorsal midline, basal segment with 0.4 of trunk length, median 0.2 and terminal 0.4. Length of basal segment 0.7 width in dorsal view. This segment mid-dorsally with antennular bursa, no ventral carina. Segment produced into short lobe at disto-lateral edge, lobe distally with four setae. Basal segment with two dorsal setose apophyses in paramedian position near rostral margin; median segment with one setose, approximately mid-dorsal apophysis also near rostral margin. Length of terminal segment 0.8 times width in dorsal view, 0.9 in ventral view; difference due to lengthwise weakly oblique segmental border between median and terminal segments. Terminal segment with disto-median lobe armed with four barbed setae and large subterminal tooth mesially accompanied by two minute teeth and laterally by one intermediate-sized tooth (Fig. 28C). Terminal segment without female lobe, no callynophore. Width of lateral antennular flagellum measured near basis 1.3–1.5 times width of mesial flagellum. Basal 6–7 segments of mesial flagellum (Fig. 28B) separated by transverse sutures, followed by consecutive clusters of oblique sutures with 1–3 transverse sutures in between; series of clusters demonstrable up to segment 20, more distal segments broken.</p><p>ANTENNA (Fig. 28D). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Segments 1–4 contribute 22%, 9%, 33% and 36% to total length of peduncle in dorsal view, vs 30%, 20%, 25% and 25% in ventral view, respectively. Difference between these views mainly reflects strongly oblique border between second segment and dorsally overlapping third segment. Two spine-like structures mesially accompanying large distal tooth of antennal scale show basal articulations (Fig. 25G), confirming that these structures are spines and not teeth.</p><p>MANDIBLES (Fig. 28E–G). Palp accidentally turned to show its rostral face, whereas the masticatory part shows its caudal face in Fig. 28E. Basal segment contributes 8–10%, median segment 61–62% and apical segment 29–30% to total palp length. Median segment 2.8–2.9 times as long as wide, mesial margin slightly sigmoid; lateral margin convex, bent mesially. Length of apical segment 3.1–3.4 times maximum width. Palp not hispid, its basal segment without setae, median segment strongly setose along mesial margin and less strongly along mesially bent lateral fold, only few setae on lateral margin, apical segment densely setose along mesial margin and with only few setae along lateral margin. Masticatory part of right mandible (Fig. 28F): pars incisiva with three large plus one medium-sized teeth; digitus mobilis with two large and eight small teeth, only largest tooth with two small humps on its concave face. Pars centralis with nine acute spines armed with a few stiff bristles, three distal spines basally thick and decreasing in length proximally, dorsally (= orally) followed by six more slender spines in dense series increasing in length proximally. Processus molaris with strong grinding lamellae distally ending in teeth, proximally with dense series of bristles. Masticatory part of left mandible (Fig. 28G): pars incisiva with three large teeth; left digitus mobilis more than twice size of right digitus, with five large and several small teeth. Pars centralis with ten slender spines armed with stiff bristles, spine length decreasing proximally; processus molaris with strong grinding lamellae not ending in teeth and with dense cover of stiff bristles on oral margin.</p><p>GUT (Figs 29B–E, 30F). Foregut similar to that of Amblyops arianii sp. nov. Both species particularly showing an unusually great diversity of (in detail differing) spines on anterior part of lateralia, in D. subchelata gen. et sp. nov. with various transitions from apically coronate (Fig. 29B 1) to apically microserrated (cactus-like) spines (Fig. 29B 2–B 3). These spines smooth along their basal to subapical portions. Central part of lateralia with slender, apically pronged, short spines (Fig. 29C), sparsely coated with minute teeth along about distal half of shaft. Posterior part of lateralia on each side with dense cluster of seven spines with dentation (unilateral serration) increasing with spine size (Fig. 29D). Dorsolateral infoldings on each side with cluster of four spines increasing in length laterally; these spines unilaterally dentate, three lateral spines with only few denticles; thicker, most mesial spine serrated by many more denticles (Fig. 29E). Setae of superomedianum as in A. arianii sp. nov. Storage volume of foregut almost empty in the two dissected specimens. Sparse presence of small unidentifiable organic particles together with two small fragments (0.2–0.3 mm) of euphausiacean larvae. Anal lobe distinct, weakly cuticularized (dashed line in Fig. 30F).</p><p>MAXILLULA (Fig. 28H). Distal segment with eleven strong spines on transverse terminal margin, these spines unilaterally serrated mostly along their subapical portions. This segment subterminally with three setae bearing long stiff barbs; no nearby pores detected. Endite of maxillula terminally with three large, distally spiny setae accompanied by several less strong barbed setae. Endite more proximally with five smooth setae. Most proximal seta backward curved. Proximal segment with low ridge bilaterally furnished with long, dense series of fine hairs (again denser than visualized in Fig. 28H), in contrast to most mysids, which exhibit only unilateral series.</p><p>MAXILLA (Fig. 28I). Sympod with three mesial lobes, densely setose along distal margin. Field of small triangular scales on sympod sub-proximally from median lobe. Mesial circumference of sympod with large fan of setae; thickest seta distally with stiff barbs; this seta, when outstretched, only marginally extending beyond fan of setae (unlike in most mysids). Exopod of maxilla closely approaches but does not reach terminal margin of basal palp segment. Exopod with dense series of plumose setae all along lateral margin; largest seta at tip (dashed line in Fig. 28I). Mesial margin without setae. Exopod bare not considering setae. Maxillary palp with distal segment contributing 4/7 of palp length. This segment three times as long as maximum width, densely setose along distal and most of mesial margin, only few setae on lateral margin, no spines. Mesial margin of proximal segment with three normal-shaped barbed setae (on rostral face, therefore visualized by dashed lines in Fig. 28I).</p><p>THORAX (Fig. 29G–J). Sternite 1 with distally rounded median lobe as in most mysids. One or two large, basally thick barbed seta closely accompanied by 0–4 smaller such setae on intersegmental joint between sternites 2 (Fig. 29G), 3 and 5–8, and respective sympods, no such setae on sternite 1 (respective parts of sympod and sternite 4 damaged). Exopods 1–2, 5–6 and 8 available, remaining exopods broken. Available basal plates with smooth cuticle, length 1.5–1.7 times maximum width (Fig. 29G), plates with minute tooth-like distal projection on disto-lateral edge. Epipod 1 leaf-like, about as long as combined ischium and merus of endopod 1; no seta (Fig. 29G). Only endopods 1 and 2 available, remaining endopods broken. Available endopods with smooth cuticle, not considering setae; no pores detected. Endopods 1–2 with six segments (Fig. 29G, I) counting from basis to dactylus. Coxa of endopod 1 (Fig. 29G) with small mesial lobe apically bearing one small barbed seta; basis with large, setose endite, remaining segments without endite. Dactylus 1 normal, with basally wide, smooth, weakly curved, acute nail (Fig. 29G–H). Dactylus 2 elongate, reflexed, bearing basally wide, smooth, acute claw facing propodus (Figs 25B, 29I–J).</p><p>MARSUPIUM (Figs 25A, 29K). Empty in holotype. Length increases by a factor of three from oostegite 1 to oostegite 3. Basal to median portions of dorsal margin without setae in oostegites 1–2, and from basal to subapical portions in oostegite 3. All oostegites with smooth cuticle, not considering setae, ventral and anterior margins plus part of posterior margin with dense series of barbed setae. Posterior part of oostegites 1–3 on inner face with comparatively long setae microserrated on their distal half. No setae on outer face of marsupium, except for 0–1 barbed seta near rostral edge of oostegite 2 (Fig. 29K).</p><p>PLEON (Figs 25A, C–D, 30A–D). Length of pleomeres 1–5 is 0.6, 0.4, 0.5, 0.4 and 0.5 times length of pleomere 6, respectively. Pleomere 6 about as long as combined pleomeres 4–5 (Fig. 25D). Female pleopods increasing in length caudally. Scutellum paracaudale subtriangular with convex margins and blunt apex.</p><p>TAIL FAN (Figs 25A, C–D, 30E–H). Uropods with smooth cuticle, not considering setae and single spine. Exopod extends 0.3–0.4 times its length beyond endopod and half its length beyond more rostrally inserting telson. Exopod measures 1.4 times endopod length and 1.7 times that of telson; endopod 1.2 telson length. Exopod with almost straight lateral margin and convex mesial margin. Margins of endopod converge in V-shaped manner up to blunt apex. Telson subbasally with a pair of transverse pore fields flanking midline (Fig. 30F); fields with 22 and 23 pores (Fig. 30G), respectively, with diameter &lt;2 µm.</p><p>Paratypes Juvenile paratype with BL 5.3 mm, not dissected, with distally rounded rostral plate extending along midline to ⅔ of antero-posterior extension of eyes (Fig. 27F), covering part of mesial portions of eyes though leaving lateral portions dorsally exposed. Rostrum shorter in immature specimen, indistinct in adult holotype. Damaged immature male with BL ≈ 9.7 mm, completely dissected (Fig. 27A–E).</p><p>Carapace with mid-sub-caudal pore group comprising nine pores. Clypeus with acute, triangular, mid-anterior extension reaching to half-length of basal segment of antennular trunk. Shape of clypeus resembles a heart in upside-down orientation.</p><p>Juvenile with essentially well-developed, probably functional eyes, though no pigment detected. Eyestalk almost all around covered by cornea, except for ocular papilla and its close surroundings and insertion of eye on frons. Ommatidia reaching surface, giving mesial eye lobe a moruloid shape (Fig. 27F). Ocular papilla measuring ⅖ of antero-posterior extension of mesial eye lobe. Left and right eyes of immature male symmetrical, showing near-complete as well as clearly incomplete ommatidia (Fig. 27C). Distal sixth of mesial eye lobe with only few incomplete ommatidia. Remaining portion with most ommatidia positioned centripetally reaching surface (Fig. 27C); major part of these ommatidia proximally with rhabdom-like striation (Fig. 27E). Lateral eye lobe with self-contained ribbon (Fig. 27B) formed by oblong ommatidia, most oriented parallel, directed laterally and containing banded rhabdom (Fig. 27D). Ocular papilla measuring ¼ of antero-posterior extension of mesial eye lobe. Papilla positioned dorsally at about one-sixth lobe width from mesial margin of mesial eye lobe. Organ of Bellonci ellipsoidal. Without inspection of non-adults, one could erroneously interpret mesial eye lobe as an eyestalk laterally bearing a rudimentary cornea, and thus entire eye as non-lobate.</p></div>	https://treatment.plazi.org/id/EF7B8639FFE0FF8BFD9C02AAFC6C2562	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFEAFF8AFDA007E9FC95236F.text	EF7B8639FFEAFF8AFDA007E9FC95236F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyopsoides O. S. Tattersall 1955	<div><p>Genus Amblyopsoides O.S. Tattersall, 1955</p><p>Amblyopsoides O.S. Tattersall, 1955: 108 (description of type species).</p><p>Amblyops – Birstein &amp; Tchindonova 1970: 284 (claimed as senior synonym of Amblyopsoides).</p><p>Amblyopsoides – Birstein &amp; Tchindonova 1970: 284 (in synonymy, not acknowledged). — Mauchline 1980: 27 (in key to genera). — Murano 1999: 1118 (in catalog). — Wittmann et al. 2014: 336 (taxonomy). — Hernández-Payán &amp; Hendrickx 2020: table 1 (species numbers, diagnostic characters of species).</p><p>Type species</p><p>Amblyopsoides obtusa O.S. Tattersall, 1955, by original designation according to ICZN (1999).</p><p>Diagnosis</p><p>Based on adults of both sexes. Carapace normal. Eye rudiments immotile, without stalks, closely set though not fused, not connected by membranous integument, lateral margins not produced in a non-sensory finger-like process; dorsal face with ocular papilla, eyes without any or with reduced ommatidia. Antennal peduncle with three segments lined in same plane. Antennal scale extends beyond antennular trunk. Scale with small apical segment in most species; mesial margin setose, lateral margin bare up to a large disto-lateral tooth at&gt; ¼ of scale length from apex. Thoracomeres and pleomeres normal. Thoracic endopods 1–8 not prehensile. Endopods 3–8, as far as known, with unsegmented carpus separated from 1–2-segmented propodus by an oblique articulation. Female, as far as known, with three pairs of well-developed oostegites. Penes well developed, bearing some setae. Male pleopods, as far as known, biramous, setose, no spines; no modified setae; exopods multi-segmented; endopod 1 unsegmented, endopods 2–5 multi-segmented. Female pleopods reduced to uniramous setose plates. Well-developed pseudobranchial lobe in both sexes. Both rami of uropods unsegmented, setose all around; endopod with 0–1 spine on mesial margin below statocyst. Telson trapezoid, without or with mid-terminal indentation, lateral margins not serrated, no lateral constriction. Proximal third to half of lateral margins bare, remaining distal portion with spines. Terminal margin with spines and mostly a pair of paramedian setae (only setae bases preserved in Fig. 36F).</p><p>New combination</p><p>Amblyopsoides laticauda (Birstein &amp; Tchindonova, 1958) comb. nov. is here recombined from Dactylamblyops laticauda Birstein &amp; Tchindonova, 1958, based on the structure of the antennal scale (as in Fig. 33D), telson (as in Fig. 38E) and eyes. Attempts to borrow the types have failed. The design of the eyes in Birstein &amp; Tchindonova (1958: fig. 28) may allege a differentiation in eyestalk and cornea, but the text clearly indicates that “The visual elements are concentrated in the basal part of the eye, particularly densely close to the basis, and disappear gradually towards the end” [translation]. Accordingly, there is no clear differentiation of an eyestalk. In addition, the eyes are dorsally flattened. In conclusion, eye structure together with the long setose lobe of the antennal scale (and less importantly also the telson structure) fit into Amblyopsoides and disprove Dactylamblyops .</p><p>Species included</p><p>– A. crozetii (G.O. Sars, 1883) from the Southern Ocean: Kerguelen and Crozet Islands, off East Antarctica, 45– 68° S, 48– 70° E and 25– 60° W, depth 800–2960 m (G.O. Sars 1884, 1885; Petryashov 2006; San Vicente 2010; see also ‘Discussion’: 133); records from the Arctic doubted by Brattegard &amp; Meland (1997) and Hernández-Payán &amp; Hendrickx (2020)</p><p>– A. fenestragothica sp. nov. from the Southern Ocean: Drake Passage and NW Weddell Sea, 61– 65° S, 53– 54° W, depth 2086–2894 m</p><p>– A. halleyi Ledoyer, 1990 from the Southern Ocean: Bellingshausen Sea, Weddell Sea and off Kerguelen Islands, 47– 74° S, 65° W – 66° E, depth 585–1223 m (Ledoyer 1990, 1995; Brandt et al. 1998; San Vicente 2010)</p><p>– A. laticauda (Birstein &amp; Tchindonova, 1958) comb. nov. from the NW Pacific: Kurile-Kamchatka Trench, 49° N, 159° E, depth 4500 m (Birstein &amp; Tchindonova 1958)</p><p>– A. lepidophthalma sp. nov. from the Southern Ocean: South Sandwich Trench and Drake Passage, 58– 59° S, 25– 60° W, depth 2281–2375 m</p><p>– A. obtusa O.S. Tattersall, 1955 from the SW Atlantic: Strait of Magellan, Patagonian shelf SW of Falkland Islands (Malvinas), 51– 55° S, 62– 69° W, depth 265–534 m (O.S. Tattersall 1955; Brandt et al. 1998, 1999)</p><p>– A. ohlinii (W.M. Tattersall, 1951) from the N Atlantic (40– 73° N, 15– 70° W) and N Pacific (39– 44° N, 143– 149° E and 31° N, 117° W), total depth range 1709–2265 m (W.M. Tattersall 1951; Fukuoka 2009; Hernández-Payán &amp; Hendrickx 2020)</p></div>	https://treatment.plazi.org/id/EF7B8639FFEAFF8AFDA007E9FC95236F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFEBFFF5FD97011DFDD72104.text	EF7B8639FFEBFFF5FD97011DFDD72104.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyopsoides fenestragothica Wittmann 2024	<div><p>Amblyopsoides fenestragothica sp. nov.</p><p>urn:lsid:zoobank.org:act: D3EB1FB5-FE5F-4F7A-A756-492E2B9D7BE7</p><p>Figs 31–36</p><p>Diagnosis</p><p>Based on immature specimens of both sexes. All features within limits of generic diagnosis. Rostrum wide-angled, broadly rounded, short, dorsally covering short subrostral lobe and less than half rostral extension of eyes. Eye rudiments separate, dorsoventrally compressed, reduced to roughly trapeziform pads without visual elements. Rudiments mid-rostrally with ocular papilla as long as ⅐ of antero-posterior extension of eye. Antennal scale extends half its length beyond antennular trunk. Scale with minute apical segment separated by a transverse suture. Lateral margin of scale bare up to a tooth at ⅓–½ of length from basis, remaining distal portion densely setose. Mouthparts normal, labrum rostrally rounded. Thoracic exopods 3–8 with 10-segmented flagellum. Endopods 4, 6 and 8 with unsegmented carpus separated from 2-segmented propodus by an oblique articulation (endopods 3, 5 and 7 broken). Immature male pleopods 1–5 biramous, well setose, no spines. Uropods setose all around, no spine. Telson roughly trapeziform, length twice maximum width and 6/5 times length of ultimate pleomere; terminal margin with ogival disto-median indentation with depth ⅘ of indentation width and 1/20 of telson length. Each lateral margin of the indentation with one seta (only setal bases preserved in Fig. 36F) near tip and a small lamina near basis. Indentation flanked by 3–4 pairs of large spines on terminal margin of telson. Telson with distal ⅗ of each lateral margin armed with series of 21–26 spines, distally somewhat discontinuously increasing in size; proximal ⅖ bare; telson with total of 48–59 spines, two laminae and two setae.</p><p>Etymology</p><p>The species name is an adjective with feminine ending, formed by linking the Classic Latin noun ‘ fenestra ’ (‘window’) with the late Latin adjective ‘ gothica ’ (‘gothic’), related to the most significant and practical feature of determination at species level, namely the mid-terminal indentation of the telson resembling a gothic window (Fig. 36F).</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♂ imm. (BL = 16.2 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS supranet; ZMH 64660.</p><p>Paratype SOUTHERN OCEAN • 1 ♀ imm. (BL = 14.1 mm); NW Weddell Sea, ANDEEP-II station 132-2; 65°17.74ʹ S, 53°22.82ʹ W to 65°17.56ʹ S, 53°22.83ʹ W; depth 2086– 2086 m; 6 Mar. 2002; EBS supranet; ZMH 64661 .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP I station 046-7: Drake Passage, South Shetland area, NE of Elephant Island, 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W, depth 2893.6– 2893.2 m. A second record was made in the NW Weddell Sea at ANDEEP II station 132-2. The resulting total range is 61– 65° S, 53– 54° W, 2086–2894 m.</p><p>Description</p><p>Holotype (♂)</p><p>All features within ranges of specific diagnosis. Immature male with BL 16.2 mm. Rostrum measures 1% of BL, carapace without rostrum 35%, cephalothorax 41%, pleon without telson 43% and telson 15%. Clypeus with short, acute, mid-rostral process (visible only in ventral view: Fig. 31C) about half as long as basal segment of antennal peduncle.</p><p>CARAPACE (Figs 31D, 33A). Normal, disto-lateral edges broadly rounded, cervical sulcus strong, no cardial sulcus visible; posterior margin concave, terminal indentation broadly rounded. Median pore group located 5% of carapace length in front of posterior margin of carapace (position indicated by arrows in Fig. 33A). This group constituted by eight pores flanking a larger pore-like structure on top of a small bulge (Fig. 31D). Carapace leaves 1½ thoracomeres mid-dorsally exposed.</p><p>EYES (Figs 32C–F, 33A). Eye rudiments large, their antero-posterior extension 0.8 times maximum width and 1.5 times length of terminal segment of antennular trunk. Large portions of dorsal face covered by tiny ‘hairs’ (Fig. 32F) which become stiff and spiniform near and on transverse terminal margin. Eye papilla ends in a toroid with central pore (Fig. 32E). Organ of Bellonci near ocular papilla.</p><p>ANTENNULA (Fig. 33B–C). Trunk measures 11% of BL, extending half its length beyond eyes. Transverse articulations between three trunk segments. Measured along dorsal midline, basal segment 0.4 of trunk length, median 0.2 and terminal 0.4. Length of basal segment 0.6 times width. Basal segment produced into a short lobe at disto-lateral edge, lobe distally with 4–5 setae; antennular bursa well developed. Terminal segment 1.2–1.3 times as long as wide, no callynophore. Disto-median lobe armed with four minute teeth increasing in size laterally, lobe disto-laterally with three barbed setae (Fig. 33C). Appendix masculina inserts ventrally near terminal margin of antennular trunk; appendix conical, apically rounded. Flagella large, width of outer flagellum measured near basis 1.1–1.2 times as wide as that of inner flagellum.</p><p>ANTENNA (Figs 31C, 33D). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Sympod angular on slightly produced disto-lateral edge, not forming a tooth-like projection. Antennal scale measures 0.2 BL, 1.6–1.7 times as long as antennular trunk and 1.7–1.8 times as long as antennal peduncle. Scale length 3.5–3.6 times maximum width. Scale well setose along mesial margin and on distal lobe. Peduncle 3-segmented, its basal segment contributes 23%, median segment 43% and terminal segment 34% to total length.</p><p>PRIMARY MOUTHPARTS (Fig. 33E–G). Labrum and labium normal. Mandibular palp as long as antennal scale. Basal segment contributes 10%, median segment 59% and apical segment 32% to total palp length. Length of median segment 3.1 times maximum width; its mesial margin convex, lateral margin slightly sigmoid. Length of apical segment 4.2 times maximum width. Palp not hispid, its basal segment without setae, median segment densely setose along lateral and mesial margins, apical segment densely setose along lateral margin and less densely along mesial margin. Right mandible (Fig. 33F): pars incisiva with three large and three small teeth; digitus mobilis with two large and several small teeth; pars centralis with series of nine tooth-like spines increasing in size distally, only five proximal spines (below drawing plane in Fig. 33F) armed with stiff bristles on basal half. Left mandible (Fig. 33G): pars incisiva with five large and several small teeth; digitus mobilis with four large teeth; pars centralis with seven slender spines distally increasing in size, all along armed with stiff bristles. Processus molaris of left (Fig. 33G vs 21D) and right (Fig. 33F vs 21E) mandibles as in Amblyops bipapillatus sp. nov.</p><p>GUT (Fig. 34). Similar to that of Amblyops bipapillatus sp. nov. (Fig. 22). As minor differences, apically coronate spines (Fig. 34B) and apically pronged spines (Fig. 34C) of lateralia in Amblyopsoides fenestragothica sp. nov. coated with minute teeth along at least distal ⅔ of shaft. Posterior part of lateralia with dense cluster of eleven spines of various size, most unilaterally serrated (Fig. 34D). Dorsolateral infoldings with cluster of five large spines, most unilaterally serrated along distal ⅔ (Fig. 34E). Storage volume filled to about ⅔ with mainly masticated, unidentifiable organic materials (detritus), mineral particles, a few sponge spicules and crustacean remains. Midgut full with organic material and a few mineral particles. Anal lobe caudally strongly cuticularized (lobe located ventrally, nonetheless visible in dorsal view through artificially bleached telson in Fig. 36A, E).</p><p>MAXILLULA (Fig. 33H). Distal segment with 12–13 strong spines on transverse terminal margin, unilaterally serrated along median portions, seven dorsal (= oral) spines serrated along aboral margin, 5–6 ventral (= aboral) spines along oral margin. This segment subterminally with three setae bearing long stiff barbs; no nearby pores detected. Endite of maxillula terminally with four large, distally spiny setae, on both sides accompanied by numerous, less strong setae. As a striking feature, two most proximal setae closely set and backward curved.</p><p>MAXILLA (Fig. 33I). Basal segment of sympod laterally with field of triangular scales similar to that (Fig. 36B) of telson but more variable in length and not organized in clusters. Distal segment of sympod with three mesial lobes, densely setose along disto-mesial margins. Convex mesial portion of sympod bearing a large, dense fan of setae. One large seta extends shortly beyond fan; on caudal face, at margin near distally neighboring lobe; with a unilateral dense series of stiff barbs along distal half. Exopod of maxilla extends shortly beyond terminal margin of basal palp segment. Exopod with dense series of plumose setae all along lateral margin. Tip of exopod with two large setae (dashed lines in Fig. 33I), mesial margin bare. Maxillary palp with distal segment contributing 57% of palp length. This segment 1.8 times as long as maximum width; segment densely setose all along distal ¾, no spines. Mesial margin of proximal segment with three basally thick barbed setae (visualized as dashed lines in Fig. 33I).</p><p>THORAX (Fig. 35A–I). Sternite 1 with distally rounded median lobe distally bearing slender triangular scales as in process from sternite 2 (Fig. 35C). A median lobe on sternite 1 is normal in Mysidae . Five basally thick, barbed setae on intersegmental joint between sternite 2 and sympod 2 (Fig. 35D). Sternites 2–4 with short, rounded median processes decreasing in size caudally (Fig. 35A); only process 2 covered with scales (Fig. 35C). Basal plates of thoracic exopods 3–8 with smooth cuticle, length twice maximum width (Fig. 35I), plates with minute tooth-like projection on disto-lateral edge (exopods 1–2 broken). Epipod 1 leaf-like, about as long as combined ischium and merus of endopod 1, no seta (Fig. 35A). Endopods with smooth cuticle, not considering setae and pores. Coxa of endopod 1 (Fig. 35A) with small mesial lobe apically bearing one small barbed seta; basis with large, setose endite, remaining segments without clear endite. About nine pores with diameter &lt;3 µm on caudal face of dactylus and about 15 pores on propodus (only six pores on distal part of propodus visualized in Fig. 35B). Endopods 1–2 with six segments (Fig. 35A, D), endopods 4, 6 and 8 with eight segments counting from basis to dactylus (Fig. 35I; endopods 3, 5 and 7 broken). Dactylus of endopod 2 not reflexed. Dactyli 4, 6 and 8 (Fig. 35H) only slightly more slender than dactyli 1–2 (Fig. 35B, E). All available dactyli with weakly curved claws; claws 1, 4, 6 and 8 smooth (Fig. 35B, H), claw 2 subapically microserrated on inner margin (Fig. 35F). Endopod 8 extends to mandibles when stretched anteriorly, and to basal third of telson when stretched posteriorly. Penes (Fig. 35I) of immature male mid-laterally with longitudinal series of 7–8 barbed setae and basally with dense coat of small, fine ‘hairs’. No spermatozoa detected.</p><p>PLEON (Figs 31A, 35J–K). Length of pleomeres 1–5 is 0.4, 0.5, 0.5, 0.5 and 0.6 times length of pleomere 6, respectively (Fig. 31A). Pleomere 6 shorter than combined length of pleomeres 4–5. Pleopods 1–5 of immature male without setae on sympod (Fig. 35J–K). Endopod and exopod still unsegmented at this stage of maturity, endopod with large pseudobranchial lobe. Endopod well setose, exopod with only few setae on and near apex. Scutellum paracaudale triangular with narrowly blunt apex.</p><p>TAIL FAN (Figs 31A, 35L, 36). Endopod and exopod of uropods 1.5 and 2.0 times as long as sixth pleomere, respectively. Exopod 5/3 times telson length; endopod 6/5 times telson length and 0.7 times exopod length (Fig. 35L). Exopod extends 0.3 times its length beyond endopod and 0.6 times beyond telson; endopod 0.4 times its length beyond telson. Exopod with slightly concave, almost straight lateral margin and with convex mesial margin; its terminus broadly rounded, convex. Margins of endopod converge in narrow V-shaped manner up to blunt apex. Uropods with smooth cuticle, not considering setae. Statoliths composed of fluorite, diameter 0.31–0.32 mm. Telson subbasally with pair of pore fields flanking midline (Fig. 36C–D); fields with 24 and 27 pores, respectively, with diameter &lt;3 µm. Telson with 2–6 µm long and 0.6–1.0 µm wide triangular scales organized in clusters of about 10–20 scales (Fig. 36B). Clusters together form narrow longitudinal ribbon (as in Fig. 19D but shorter), proceeding close to each lateral margin between ⅕ and ½ of telson length from basis. Lateral margins (Fig. 36A) armed with 25–26 spines; telson with total of 59 spines.</p><p>Paratype (♀)</p><p>Terminal segment of antennular trunk without female lobe. Position of tooth at outer margin of antennal scale at one-third of scale length in immature female with BL 14.1 mm (vs at half scale length in holotype with BL 16.2 mm). Terminal margin of telson with three pairs of large spines flanking mid-terminal indentation (vs four pairs in holotype). Each lateral margin of telson armed with 21 spines; telson with total of 50 spines.</p></div>	https://treatment.plazi.org/id/EF7B8639FFEBFFF5FD97011DFDD72104	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF95FFFDFD96056EFD0B2296.text	EF7B8639FF95FFFDFD96056EFD0B2296.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amblyopsoides lepidophthalma Wittmann 2024	<div><p>Amblyopsoides lepidophthalma sp. nov.</p><p>urn:lsid:zoobank.org:act: 830B8838-C5F9-4C1B-AF7E-D2489C265D2E</p><p>Figs 37–40</p><p>Diagnosis</p><p>Based on subadults of both sexes. All features within limits of generic diagnosis. Frontal margin of carapace obtuse-angled. Carapace covers less than a third of rostral extension of eyes, its antero-lateral edges broadly rounded. Eye rudiments separate, dorsoventrally compressed, reduced to roughly trapeziform, almost triangular pads without visual elements. Eyes dorsally hispid all over, mid-rostrally with ocular papilla projecting one-tenth of antero-posterior extension of eye. Transverse articulations between three antennular trunk segments. Antennal peduncle with three segments lined in a single plane. Antennal scale extends half its length beyond antennular trunk. Scale with minute apical segment separated by a transverse suture. Lateral margin bare up to a tooth at half length of scale, remaining distal portion densely setose. Mouthparts normal, labrum rostrally angular with rounded tip. Thoracic exopod 1 with 9-segmented flagellum, exopods 2–8 with 10-segmented flagellum. Endopods 3–8 with unsegmented carpus separated from 2-segmented propodus by an oblique articulation; both segments of propodus again separated by an oblique articulation from each other. Subadult male with pleopods 1–5 biramous, no spines; sympod without setae, exopod and endopod with setae. Endopod of uropods with one slender spine near mesial margin below statocyst. Telson trapezoid with distally continuously converging margins, length 5/3 times maximum width near basis, five times width at terminus, and about 11/10 length of ultimate pleomere. Terminal margin with very shallow (1–3% of telson length) median indentation bearing a pair of small laminae. A pair of barbed setae may be present between laminae in some specimens. Indentation flanked by 2–3 pairs of large spines in all specimens. Lateral margins of telson proximally bare, distal ⅗ with 20–26 spines discontinuously increasing in length distally, proximal 11–15 spines organized in groups of large spines with 1–2 small spines in between. Telson with total of 45–58 spines, always with pair of paramedian laminae, pair of setae not always present.</p><p>Etymology</p><p>The species name is an adjective with Latinized feminine ending, formed by fusion of the Classic Greek adjective ‘λεπιδωτός’ (‘scaly’) with the noun ‘ὀφθαλμός’ (‘eye’), related to the scaly (Fig. 38D) eye rudiments. The adjectivation of the noun has precedence in the moth Elachista ophthalma Kaila, 2011 .</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♂ subad. (BL = 21.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.015833&amp;materialsCitation.latitude=-58.4155" title="Search Plazi for locations around (long -25.015833/lat -58.4155)">South Sandwich Trench</a>, E of Montagu Island, ANDEEP-II station 141-10; 58°25.08ʹ S, 25°00.77ʹ W to 58°24.93ʹ S, 25°00.95ʹ W; depth 2313– 2281 m; 23 Mar. 2002; EBS supranet; ZMH 64662.</p><p>Paratypes SOUTHERN OCEAN • 1 ♀ subad. (BL = 18.9 mm), 7 imm., 14 juv.; same collection data as for holotype; ZMH 64666 • 1 ♀ imm. (BL = 11.0 mm); same collection data as for holotype except for occurrence in epinet; ZMH 64664 • 1 imm. (BL = 8.1 mm); same collection data as for preceding; ZMH 64665 • 1 ♀ subad. (BL = 24.4 mm at premolt stage, ovarian tubes full with large eggs, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.0665&amp;materialsCitation.latitude=-59.373333" title="Search Plazi for locations around (long -60.0665/lat -59.373333)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 041-3; 59°22.24ʹ S, 60°04.06ʹ W to 59°22.40ʹ S, 60°03.99ʹ W; depth 2375– 2372 m; 26 Jan. 2002; EBS epinet; ZMH 64663 .</p><p>Type locality and distribution</p><p>The type locality is South Sandwich Trench, east of Montagu Island, 58°25.08ʹ S, 25°00.77ʹ W to 58°24.93ʹ S, 25°00.95ʹ W, depth 2313– 2281 m. Also found in the Drake Passage, NW of Elephant Island. The resulting total ranges are 58– 59° S, 25– 60° W, depth 2281–2375 m.</p><p>Description</p><p>Holotype (♂)</p><p>Subadult male not dissected (Figs 37, 38G, 39K). Fig. 39A–J, L of a paratype serves to illustrate situation in non-dissected holotype. All features of holotype within ranges of specific diagnosis. Body length 21.4 mm. Rostrum measures 3% of BL, carapace without rostrum 29%, cephalothorax 35%, pleon without telson 50% and telson 12%. Clypeus with short, spear-like mid-rostral process (visible only in ventral view: Fig. 37E) nearly as long as proximal segment of antennular trunk.</p><p>CARAPACE (Fig. 37A–B). Normal, anterior margin uptilted (Fig. 37C), forming a short obtuse-angled rostrum ⅕ of length of terminal segment of antennular trunk. Cervical sulcus strong, cardial sulcus distinct; posterior margin concave, broadly rounded. Carapace leaves only ultimate thoracomere mid-dorsally exposed.</p><p>EYES (Fig. 37D). Eye rudiments large, their antero-posterior extension 0.8–0.9 times maximum width and 1.2 times length of terminal segment of antennular trunk. Eyes dorsoventrally flattened by a factor of 3.0. Cuticle hispid over most of dorsal, lateral and frontal faces. Ocular papilla emerges dorsally closely behind rostral margin. Papilla small, proximally hispid due to smaller scales compared to those of main body of eye rudiments.</p><p>ANTENNULA (Fig. 39C). Trunk measures 10% of BL, extending ¾ of its length beyond eyes. Measured along dorsal midline, basal segment is 0.4 of trunk length, median 0.2 and terminal 0.4. Length of basal segment 0.6 times width. Basal segment produced in a short lobe at disto-lateral edge, lobe distally with four setae. Terminal segment of antennular trunk 1.1 times as long as wide (Fig. 37D). Terminal segment with disto-median lobe armed disto-laterally with four barbed setae (for teeth see paratypes below). Appendix masculina inserts ventrally near terminal margin of antennular trunk; appendix conical, apically rounded, still small at this stage of maturity. Flagella large, width of outer flagellum measured near basis 1.1 times width of inner flagellum.</p><p>ANTENNA (Fig. 37C–E). Antennal scale measures 18% of BL. Scale length 3.5 times maximum width, 1.7 times length of antennular trunk and 2.0 times length of antennal peduncle. Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Sympod with slightly produced disto-lateral edge forming small tooth-like projection. Scale well setose along mesial margin and on distal lobe. Peduncle 3-segmented, its basal segment contributes 25%, median segment 40% and terminal segment 35% to total length.</p><p>CEPHALOTHORAX (Fig. 37). Rostral half of labrum right-angled triangular with blunt apex (Fig. 37E; dorsoventrally inclined in Fig. 39E). Basal plate of exopods 1–8 twice as long as maximum width. Plates increase by total of ⅖ of length from plate 1 to plate 5 and then decrease by ⅕ down to plate 8. Plates 1–8 with smooth cuticle, disto-lateral edge with tooth-like projection (less tooth-like in Fig. 40F for a paratype). Endopods very slender (as in Fig. 40K), endopod 3 measures one-fourth of BL, endopod 4 one-third (endopods 5–8 broken in holotype). Endopod 3 extending to distal end of antennular trunk when stretched anteriorly and to pleomere 2 when stretched posteriorly. Endopods 1–2 with six segments, endopods 3–4 with eight segments counting from basis to dactylus. Endopods with smooth cuticle, not counting setae and pores. Dactyli 1–2 large as in most Mysidae, in contrast to tiny dactyli 3–4 (as in Fig. 40K–L). Dactylus 2 not reflexed. Dactyli 1–4 with smooth, weakly curved claws. Claws 1–2 strong; claws 3–4 small, needle-like. Penes small, already longer than wide at this stage of maturity.</p><p>PLEON (Figs 37A–B, 39K). Length of pleomeres 1–5 is 0.6, 0.6, 0.5, 0.5 and 0.6 times length of pleomere 6, respectively. Endopod of pleopods 1–5 with large pseudobranchial lobe. Endopods 3 and 5 ninesegmented and exopods unsegmented at this stage of male maturity (Fig. 39K). Endopods well setose, exopods with only few setae on and near apex. Scutellum paracaudale triangular with slightly convex flanks and with narrowly blunt, almost acute apex.</p><p>TAIL FAN (Figs 37A–B, 38E, G). Endopod and exopod of uropods 1.2 and 1.8 times as long as sixth pleomere, respectively. Exopod 1.7 times telson length; endopod 1.2 times telson length and 0.6 times exopod length. Exopod extends 0.3 times its length beyond endopod, 0.4 times beyond telson and endopod 0.2 times its length beyond telson. Exopod with slightly concave, almost straight lateral margin and with well convex mesial margin; its terminus broadly rounded, convex. Margins of endopod converge in narrow V-shaped manner up to blunt apex. Uropods with smooth cuticle, not considering setae and single spine. Lateral margins of telson armed with 25–26 spines; telson with total of 57 spines and a pair of paramedian setae flanked by a pair of laminae (Fig. 38G).</p><p>Paratypes</p><p>CARAPACE (Fig. 39A–B). Median pore group located 5% of carapace length in front of posterior margin of carapace, constituted by ten pores flanking a larger pore-like structure (Fig. 39B) on top of a low bulge.</p><p>EYES (Figs 38B–D, 39A). Expanded on slide. Papilla ends in a toroid with central pore (Fig. 38B). Completely internal, ovoid cell mass proximally close to papilla interpreted as organ of Bellonci; this organ drawn as tiny dashed ellipsoid in Fig. 39A. Dorsal face of (mounted) eyes covered with minute, acutely-tipped triangular scales laterally and frontally increasing in size by a factor of ≈2–3 (Fig. 38C vs 38D).</p><p>ANTENNAE S. LAT.. (Fig. 39C–D). Basal segment of antennular trunk with well-developed antennular bursa. Terminal segment of trunk with disto-median lobe armed with four barbed setae and with 3–4 minute teeth increasing in size laterally as in Fig. 33C; no female lobe, no callynophore. Position of tooth at outer margin of antennal scale varies with body size: arising at one-third of scale length from basis in juveniles with BL 7–10 mm (n = 10) vs at half scale length in subadults with BL 19–24 mm (n = 3).</p><p>MANDIBLES (Fig. 39F–H). Palp of both mandibles and processus molaris of right mandible as in A. fenestragothica sp. nov. (33E–G), but left processus molaris (Fig. 39H) less strongly cuticularized. Right mandible (Fig. 39G) in A. lepidophthalma sp. nov.: pars incisiva with three large and two intermediate-sized teeth; digitus mobilis with one large and about five small teeth; pars centralis with series of nine tooth-like spines increasing in size distally, four large, distal-most spines armed with small secondary humps (worn-out toothlets?). Left mandible (Fig. 39H): pars incisiva with three large and a cluster of five small teeth; digitus mobilis with four large teeth; pars centralis with six slender spines distally increasing in size (smaller spines covered by trunk, not visualized in Fig. 39H), all along armed with stiff bristles.</p><p>GUT (Fig. 40B–E). Foregut most similar to that of A. fenestragothica sp. nov. (Fig. 34). As a notable difference, posterior part of lateralia on each side with dense cluster of five rather than eleven subequal spines. Storage volume empty. Anal lobe moderately cuticularized.</p><p>MAXILLULA (Fig. 39I). Only minor differences from that of A. fenestragothica sp. nov. (Fig. 33H). Distal segment with seven dorsal (= oral) spines serrated along aboral margin, 3–4 ventral (= aboral) spines along oral margin and two large ventral spines not serrated. Endite of maxillula terminally with 3–4 large, distally spiny setae. Only one (most proximal) seta backward curved in A. lepidophthalma sp. nov. MAXILLA (Fig. 39J).Almost identical to that of A. fenestragothica sp. nov. (Fig. 33I).As almost negligible differences, length of distal segment of palp 1.8–1.9 times maximum width and 59–60% of total palp length in A. lepidophthalma sp. nov.</p><p>THORAX (Fig. 40F–L). Sternite 1 with smooth, distally rounded median lobe. A median lobe on this sternite is normal in Mysidae . Closely set, basally thick, barbed setae on intersegmental joint between sternites 2–8 and their respective sympods (Fig. 40F, K), no such setae on sternite 1. Sternites 2–8 each with acutely triangular median process. Processes on sternites 2–3 clearly larger than subequal processes on 4–8 (Fig. 40F). Only process on sternite 8 covered all around with triangular, mostly slender scales (Fig. 40F, H). Epipod 1 leaf-like, about as long as combined ischium, merus and carpus of endopod 1, no seta (Fig. 40F). Basal plate of exopods 2–8 with tooth-like projection from disto-lateral edge; small projection not always present in exopod 1. Coxa of endopod 1 mesially with one small barbed seta; basis with large, setose endite on rostral face (endite indicated by dashed line in Fig. 40F), remaining segments without endite. Propodus of endopod 1 with about 16–20 loosely scattered pores (Fig. 40G) with diameter ≤3 µm on caudal face. Endopods 3–8 each with eight segments counting from basis to dactylus (Fig. 40K); these endopods 30–40% of BL; small dactylus with tiny, needle-like claw (Fig. 40L). Endopod 8 extends to mandibles when stretched anteriorly and to basal third of telson when stretched posteriorly.</p><p>TAIL FAN (Figs 38E–F, 40M). Statoliths composed of fluorite, diameter 0.26–0.27 mm (n = 2). Telson with pair of subbasal pore fields (Fig. 38E) flanking midline; each field with about 40 pores with diameter &lt;3 µm (only part of pores in focus in Fig. 38F). Two barbed setae visible between disto-paramedian laminae (Fig. 38E) in ten out of 21 telsons inspected. No scales such as otherwise found along lateral telson margins detected in Amblyopsoides fenestragothica sp. nov., Amblyops arianii sp. nov., A. bipapillatus sp. nov., A. tattersalli, Dactylamblyops benthophilus sp. nov. or Desmocornea subchelata gen. et sp. nov. These species share a pair of paramedian pore fields near basis of telson with Amblyopsoides lepidophthalma sp. nov.</p></div>	https://treatment.plazi.org/id/EF7B8639FF95FFFDFD96056EFD0B2296	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF9CFFFCFDAC00B2FBC22353.text	EF7B8639FF9CFFFCFDAC00B2FBC22353.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Paramblyops Holt & Tattersall 1905	<div><p>Genus Paramblyops Holt &amp; Tattersall, 1905</p><p>Paramblyops Holt &amp; Tattersall, 1905: 124, pl. xxi.</p><p>Paramblyops – Tattersall &amp; Tattersall 1951: 255 (diagnosis). — O.S. Tattersall 1955: 111 (short description). — Birstein &amp; Tchindonova 1970: 288, figs 7–8 (species description). — Mauchline 1980: 27–28 (taxonomy, in key to genera). — Murano 1981: 288–289 (description, key to species); 2002a: 35, table 1 (diagnosis, definition of species groups). — Tchindonova 1981: 26 (deep sea, distribution); 1993: 156–157, fig. 2 (partim, vertical distribution). — San Vicente 2010: 17, 47 (short diagnosis, Antarctic); 2017: table 2 (geographical and bathymetric distribution). — Petryashov 2014b: 188 (distribution). — Wittmann et al. 2014: 336 (taxonomy). — Petryashov &amp; Frutos 2017: 404 (in key to genera). — Mees &amp; Meland 2024: AphiaID 119891 (accepted).</p><p>Type species</p><p>Paramblyops rostrata Holt &amp; Tattersall, 1905, by original designation according to ICZN (1999).</p><p>Diagnosis</p><p>Based on adults of both sexes. Eye rudiments without stalk, separate, not connected by membranous integument, positioned laterally, each reduced to roughly triangular or rectangular pads with only disto-lateral edge produced into a tooth-like non-sensory projection, no visual elements, no ocular papilla. Antennular trunk with three segments separated by transverse articulations; basal segment without ventral carina. Antennal scale not subdivided, bare portion of lateral margin distally ending in a single, strong tooth; mesial margin setose all along. Antennal peduncle with three segments lined in a single plane. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Endopods 3–8, as far as known, with oblique articulation between carpus and propodus. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod. Endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with small, setose pseudobranchial lobe; endopod 4 with modified setae in certain species. Uropods setose all around, without any or with a single spine below statocyst. Telson trapeziform, distally converging, no lateral constriction, terminally truncate without any or with small median indentation. Lateral margins all along or only distally with densely set spines. Terminal margin mesially with small spines plus 0–3 setae, in any case altogether flanked by large spines.</p><p>Species included (7 species acknowledged)</p><p>— P. brevirostris O.S. Tattersall, 1955 from the Southern Ocean: circum-Antarctic, 62– 72° S, depth 160–4655 m (O.S. Tattersall 1955; Petryashov 2006, 2014b; San Vicente 2010; present paper: 78)</p><p>— P. hamatilis Fukuoka, 2009 from the NW Pacific, E of Japan, 39– 43° N, 141– 143° E, depth 1535– 2137 m (Fukuoka 2009)</p><p>— P. macrops Murano, 2007 from the E Indian Ocean: Timor Sea, 13° S, 123° E, depth 535–547 m (Murano 2007)</p><p>— P. petrescui sp. nov. from the Southern Ocean: NW Weddell Sea, 65° S, 52° W, depth 3049–3050 m</p><p>— P. rostratus Holt &amp; Tattersall, 1905 from the E Atlantic (Angola Basin, Morocco, off Ireland, Faroes, Iceland), NW Atlantic (U.S. east coast) and Mediterranean (Catalan Sea, Tyrrhenian Sea), 16° S – 64° N, 14° E – 72° W, depth 280–5434 m (Colosi 1929; W.M. Tattersall 1951; Tattersall &amp; Tattersall 1951; Lagardère 1972; Cartes &amp; Sorbe 1995; San Vicente 2017; Wittmann 2020; Astthorsson &amp; Brattegard 2022)</p><p>— P. spatulicaudus Murano, 2002 from the Indo-Pacific: Sulu Sea, 8° N, 122° E, depth 4890 m (Murano 2002a)</p><p>— P. tenuicaudus Murano, 2002, from the Indo-Pacific: Sulu Sea, 8° N, 118° E, depth 495–500 m (Murano 2002a)</p><p>Note. As concluded in the ‘Discussion’ below, P. bidigitatus W.M. Tattersall, 1911 and P. japonicus Murano, 1981 are not included here but transferred to Amphiakrops gen. nov. In addition, P. globorostris Birstein &amp; Tchindonova, 1970 is transferred to Chelamblyops gen. nov.</p></div>	https://treatment.plazi.org/id/EF7B8639FF9CFFFCFDAC00B2FBC22353	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF9DFFFFFDBC01E8FE37229B.text	EF7B8639FF9DFFFFFDBC01E8FE37229B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Paramblyops brevirostris O. S. Tattersall 1955	<div><p>Paramblyops brevirostris O.S. Tattersall, 1955</p><p>Paramblyops brevirostris O.S. Tattersall, 1955: 112–113, fig. 25.</p><p>Paramblyops brevirostris – Ledoyer 1990: 40, fig. 2b (morphology, Antarctic record with query). — Ariani et al. 1993: table 1 (mineral composition of statoliths). — Wittmann 1996: fig. 1f (Antarctic record). — Brandt et al. 1998: table i (biogeography, endemism). — Murano 2002a: table 1 (morphology, taxonomy). — San Vicente et al. 2006: table 2 (records in Southern Ocean). — San Vicente 2010: 60 (in key to Antarctic species). — Petryashov 2014a: 150, map 10 (biogeography, Antarctic distribution). — Wittmann &amp; Ariani 2019: suppl. (statolith composition, biogeography). — Mees &amp; Meland 2024: AphiaID 226324 (accepted).</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 imm. (damaged, BL = 14.2 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-0.0365&amp;materialsCitation.latitude=-67.4935" title="Search Plazi for locations around (long -0.0365/lat -67.4935)">eastern Weddell Abyssal Plain</a>, S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet • 1 ♀ ad. (damaged, BL = 32.2 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.5855&amp;materialsCitation.latitude=-70.5365" title="Search Plazi for locations around (long -14.5855/lat -70.5365)">eastern Weddell Slope</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.5855&amp;materialsCitation.latitude=-70.5365" title="Search Plazi for locations around (long -14.5855/lat -70.5365)">Kapp Norvegia</a>, ANDEEP-III station 081-8; 70°32.02ʹ S, 14°35.05ʹ W to 70°32.19ʹ S, 14°35.13ʹ W; depth 4392– 4385 m; 24 Feb. 2005; EBS epinet • 1 ♂ ad. (damaged, BL = 33.8 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.5855&amp;materialsCitation.latitude=-70.5365" title="Search Plazi for locations around (long -14.5855/lat -70.5365)">same collection data as for preceding except for occurrence in supranet</a> • 1 juv. (BL = 6.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-50.634834&amp;materialsCitation.latitude=-63.628834" title="Search Plazi for locations around (long -50.634834/lat -63.628834)">Weddell Slope</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-50.634834&amp;materialsCitation.latitude=-63.628834" title="Search Plazi for locations around (long -50.634834/lat -63.628834)">entrance to Powell Basin</a>, ANDEEP-III station 121-10; 63°37.73ʹ S, 50°38.09ʹ W to 63°37.55ʹ S, 50°38.37ʹ W; depth 2663– 2659 m; 15 Mar. 2005; EBS supranet • 1 juv. (BL = 3.1 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.469833&amp;materialsCitation.latitude=-61.8095" title="Search Plazi for locations around (long -47.469833/lat -61.8095)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 150-6; 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W; depth 1996– 1993 m; 20 Mar. 2005; EBS epinet .</p><p>Morphological notes</p><p>Short, broadly subtriangular to about rectangular, apically narrowly rounded rostrum. Disto-lateral edge of eye rudiments forming a short, tooth-like, non-sensory projection; no ocular papilla. Organ of Bellonci in basal position. Antennular trunk with five barbed setae on disto-median lobe, no tooth. Trunk with well-developed antennular bursa, no female antennular lobe, no callynophore.</p><p>Type locality and distribution</p><p>The type locality is Chollaert Channel, Palmer Archipelago. According to Article 76.1 of the ICZN (1999) the type locality encompasses both detailed localities of the syntypes specified by O.S. Tattersall (1955), namely Discovery stations no. 181 (64°20ʹ S, 63°01ʹ W, depth 160–335 m) and no. 182 (64°21ʹ S, 62°58ʹ W, depth 278–500 m) as long as no lectotype is defined; the coordinates are taken from the Discovery Committee (1929). Combined data by Petryashov (2006) and San Vicente (2010) give the distribution of this species as the South Shetland Islands, Antarctic Peninsula, Weddell Sea and Bellingshausen Sea, 65° S – 72° S, depth 160–529 m, not including the unsure record by Ledoyer (1990) in the Weddell Sea at 74° S at depths of 1996–2012 m. The present records from the Powell Basin and the Weddell Sea at 62° S – 71° S obtained on the sea floor at depths of 1991–4655 m mean a strong vertical range extension. Accordingly, the species appears to be circum-Antarctic with proven range of 62° S – 72° S, 160–4655 m.</p></div>	https://treatment.plazi.org/id/EF7B8639FF9DFFFFFDBC01E8FE37229B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF9EFFE4FDDA00A1FDC5245B.text	EF7B8639FF9EFFE4FDDA00A1FDC5245B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Paramblyops petrescui Wittmann 2024	<div><p>Paramblyops petrescui sp. nov.</p><p>urn:lsid:zoobank.org:act: DEE643B6-6E0C-4B3D-A427-2B5DC2F4A9D2</p><p>Figs 41–44</p><p>Diagnosis</p><p>Based on adult female only. All known features within limits of generic diagnosis. Carapace with bare margins all around, no toothed ‘shoulders’. Rostrum broadly rounded, very short, covering only basal portions of subrostral lobe, which covers only about half ‘length’ of eyes. Eye rudiments separate, dorsoventrally compressed, reduced to roughly subtriangular pads, mesially rounded, disto-laterally with one tooth-like projection, no visual elements, no ocular papilla. Antennal sympod without teeth near disto-lateral edge. Clypeus with short, acutely converging, mid-rostral process, due to small size visible only in ventral view. Mouthparts normal, labrum rostrally rounded. Marsupium formed by three pairs of oostegites. Endopod of uropods with one small spine mesially below statocyst. Telson trapeziform, distally converging, length 5/3 times maximum width; its basal third with bare lateral margins; distal ⅔ of each lateral margin with 16 densely-set spines, distally weakly increasing in size in roughly continuous series. Transverse terminal margin of telson with weak mid-terminal indentation bearing plumose setae between minute spines; indentation flanked by four pairs of large spines, increasing weakly in size from submedian to most lateral position.</p><p>Etymology</p><p>The species name is a noun with masculine ending in genitive singular, dedicated to Iorgu Petrescu in recognition of his important contributions to the taxonomy of cumaceans.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ ad. (BL = 38.7 mm, on slides); NW Weddell Sea, ANDEEP-II station 131-3; 65°19.83ʹ S, 51°31.62ʹ W to 65°19.95ʹ S, 51°31.41ʹ W; depth 3049–3050 m; 5 Mar. 2002; EBS epinet; ZMH 64684.</p><p>Type locality</p><p>The type locality is ANDEEP II station 131-3: NW Weddell Sea, 65°19.83ʹ S, 51°31.62ʹ W to 65°19.95ʹ S, 51°31.41ʹ W, depth 3049–3050 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features as in specific diagnosis. Female with BL 38.7 mm, marsupium empty (Fig. 41A). Rostrum contributing 1% to BL, carapace 25% (without rostrum), thorax 32%, pleon 55% and telson 12%. Subrostral lobe (Fig. 41B–C) dorsally completely covered by densely set, ellipsoidal cuticular structures, representing minute depressions in part (accidentally) filled with external material (Fig. 41E). Cuticular depressions of various sizes locally present on part of antennular trunk, antennal peduncle, carapace (arrows in Fig. 41C), eyes, posterior thoracic sternites, basal plates of thoracic exopods 1–8 and outer face of oostegite 3 (Fig. 41E–F).</p><p>CARAPACE (Fig. 42C). With disto-lateral edges well rounded; its anterior margin with small triangular processes flanking short rostrum. Cervical sulcus distinct, cardial sulcus not established, no pores detected. Posterior margin weakly concave. Carapace leaving one thoracic segment exposed dorsally.</p><p>EYE RUDIMENTS (Figs 41B, 42C). Proximo-lateral portions of eye rudiments with similar, narrower, less densely set cuticular depressions compared with subrostral process (Fig. 41F–G). Eyes with tooth-like projection (when oriented anteriorly) extending at most to median segment of antennular trunk. Eyes without pores, no pigment, no organ of Bellonci.</p><p>ANTENNULA (Figs 41B, 42A). Basal segment of trunk with disto-lateral setose lobe extending beyond proximal half of median segment. Basal segment dorsally with well-developed antennular bursa and two setose apophyses. Median segment with many setae closely behind its rostral margin, no apophysis. Terminal segment almost as long as combined median and basal segments; disto-median lobe with four barbed setae, no tooth. This segment without female lobe and without callynophore. Basal portion of inner flagellum 0.8 times as wide as in outer flagellum.</p><p>ANTENNA (Fig. 42B). Sympod 2-segmented, caudally in addition with end sac of antennal gland. Sympod with distally rounded, linguiform lobe positioned ventrally behind antennal scale. Peduncle 3-segmented, its basal segment contributes 18%, median segment 52% and terminal segment 29% to total length. Its basal segment bare, median and terminal segments each with a few barbed setae and several smooth setae close to distal margin, lateral margins without setae. Antennal scale distally broken.</p><p>PRIMARY MOUTHPARTS (Fig. 42D–H). Labrum and labium normal. Mandibular palp with basal segment contributing 8%, median segment 59%, and terminal segment 33% to total palp length. Palp not hispid, its basal segment without setae. Length of median segment 2.0 times maximum width, mesial and lateral margins convex, setose. Terminal segment 3.6 times as long as broad and 0.5 times as long as median segment. Terminal segment well setose, with dense series of short, microserrated setae on distal ¾ of mesial margin. Right mandible (Fig. 42G) with three large teeth on pars incisiva and with six smooth blunt processes (worn teeth?) on well-developed digitus mobilis. Pars centralis modified, with continuous series of 13 tooth-like spines proximally (with respect to mouth field) increasing in length and slenderness; most spines smooth, only five most proximal spines slightly microserrated by stiff bristles. Processus molaris plate-like with stiff bristles along most of its periphery. Left mandible (Fig. 42F) less modified, pars incisiva with three large teeth, most proximal broad and bumpy, resembling a mammalian molar tooth. Digitus mobilis also bumpy with three large and two small teeth. Pars centralis with ten slender spines bearing stiff bristles. Processus molaris with strong grinding lamellae and with bundles of stiff bristles on and near proximal edge.</p><p>GUT. Foregut (Fig. 43B–E) essentially as in Amblyopsoides fenestragothica sp. nov. (Fig. 34). As main differences, modified spines on anterior part of lateralia not serrated (Fig. 43B–C vs Fig. 34B–C) and spines on posterior part of lateralia and on dorsolateral infoldings less strongly serrated (Fig. 43D–E vs Fig. 34D–E). Storage volume filled to about ⅔ by numerous crustacean remains, unidentified masticated organic material, mineral particles and a few foraminiferans. Midgut full of finely masticated material and large amounts of mineral particles. Anal lobe distinct, weakly cuticularized.</p><p>MAXILLULA (Figs 41D, 42I–J). Distal segment with 9–10 strong spines on transverse terminal margin; most distal spine smooth, remaining spines unilaterally, bluntly serrated (Fig. 42J). This segment subterminally with 3–4 setae bearing long stiff barbs. Field of 16–20 pores laterally (= aborally) from this group of setae (not every pore visualized in Fig. 41D). Lateral margin of basal segment furnished with longitudinal, comparatively long series of densely set long hairs. Endite terminally with three large, distally spiny (by stiff bristles) setae flanked by several less strong, shorter setae of that kind. Both sides of endite with numerous additional, barbed setae. As also in Dactylamblyops benthophilus sp. nov., most proximal seta of endite long, slender and backward curved.</p><p>MAXILLA (Fig. 43A). Most similar to that of Amphiakrops brandtae gen. et sp. nov. (Fig. 60A). Sympod with three mesial, only distally strongly setose lobes. Exopod extends to distal margin of basal segment of palp. Exopod with numerous plumose setae all along lateral margin; longest seta at tip (accidentally bent backward in Fig. 43A), mesial margin bare. Palpus with apical segment 1.2 times as long as basal segment. Apical segment 1.8–2.2 times as long as maximum width. Basal segment basally broader, its mesial margin with three densely barbed, basally thick setae. Distal ⅔ of apical segment with well setose margins, proximal third bare except for minute hairs, no spines.</p><p>THORAX (Fig. 43F–I). Sternite 1 on each side with small, dense field (shaded areas in Fig. 43F) of slender triangular scales. Group of 4–5 basally thick setae on intersegmental joint between sympod 2 and sternite 2. Basal plates of exopods 1–7 about twice as long as maximum width, three times as long as width in exopod 8. Disto-lateral edge with small tooth-like projection in all basal plates. Flagellum of exopods 1–8 with 18–19, 20–21, 22, 21, 21, 20, 22 and 20 segments, respectively (n = 2, 2, 1, 1, 1, 1, 1, 1). Basis of endopod 1 with setose endite (below drawing plane, visualized as dashed line in right endopod drawn to the left in Fig. 43F), remaining segments without endite. Endopod 1 densely setose along mesial margin, much less along lateral margin; its smooth apical claw (Fig. 43G) almost as long as dactylus. Epipod 1 (Fig. 43F) linguiform with narrowly blunt apex, about as long as combined ischium, merus and carpus of endopod 1; no seta. Endopod 2 (Fig. 43H) with six segments counted including basal segment, the latter fused with sympod, no endites; dactylus densely setose, remaining segments less setose; dactylus not clearly reflexed, no claw detected in dense jungle of setae. Thoracic endopods 3–8 broken.</p><p>MARSUPIUM (Fig. 43I). Proximal portion of oostegite 1 with dense brush of setae on inner face. These comparatively long setae microserrated by series of stiff, acute bristles along distal half. Less dense brush of such setae on oostegite 2, even fewer on oostegite 3. Only distal third of oostegite 1 with barbed to plumose setae along its margins. Ventral margin of oostegite 1 all along furnished with setae, proximally with microserrated setae, distally turning into barbed setae and finally into plumose setae in about continuous series. Proximal third of dorsal margin bare, central third densely lined by tiny hairs. Most of dorsal margin bare in oostegites 2–3. These oostegites with ventral and anterior margins plus part of posterior margin bearing dense series of barbed to plumose setae contributing to ventral and caudal ventilation-pervious closure of marsupium. Oostegites 1–2 with smooth cuticle on outer and inner faces, not counting brush of setae proximally on inner face. Only oostegite 3 with cuticular ornamentation (Fig. 41E–F) and with many loosely scattered, slender whip setae on outer face.</p><p>PLEON AND TAIL FAN (Figs 41A, 44). Pleomeres 1–5 are 0.5, 0.7, 0.6, 0.6 and 0.7 times length of pleomere 6, respectively; this value 1.7 for exopod of uropods, 1.2 for endopod and 1.0 for telson (Fig. 41A). Pleopods 1–5 widening from basis up to rudiment of pseudobranchial lobe, followed by a more slender, straight distal portion on top; setation as in Fig. 44A–E. Pleopod length increasing caudally. Scutellum paracaudale triangular with acute tip. Uropods (Figs 41A, 44F) all around with setose margins, exopod extends 0.3 times its length beyond endopod and 0.4 times beyond telson. Statoliths composed of fluorite, diameter 0.25–0.26 mm (n = 2). Lateral margins of telson (Fig. 44G) weakly sigmoid, almost straight. Telson with total of 43 spines and three plumose setae, no pores, no scales (such as otherwise found in Figs 8G, 14E). Telson furnished with 2×16 small spines on lateral margins, 2× 4 large spines on terminal margin and three minute spines plus three setae in mid-terminal indentation. Additional specimens needed to judge whether asymmetrical arrangement of setae within indentation (Fig. 44H) represents a normal feature.</p></div>	https://treatment.plazi.org/id/EF7B8639FF9EFFE4FDDA00A1FDC5245B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF85FFE7FDFD06E9FE6927A3.text	EF7B8639FF85FFE7FDFD06E9FE6927A3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Scolamblyops Murano 1974	<div><p>Genus Scolamblyops Murano, 1974</p><p>Scolamblyops Murano, 1974: 225–226 .</p><p>Scolamblyops – Mauchline 1980: 27 (in key to genera). — Nouvel et al. 1999: 79 (systematics). — Fukuoka &amp; Murano 2006: table iii (pleopod morphology). — Wittmann et al. 2014: 336 (systematics). — Petryashov &amp; Frutos 2017: 405 (in key to genera). — Mees &amp; Meland 2024: AphiaID 226134 (accepted).</p><p>Type species</p><p>Scolamblyops japonicus Murano, 1974, by original designation. So far only females known (Murano 1974a; Fukuoka 2009).</p><p>Revised diagnosis</p><p>Diagnosis of Murano (1974a) revised to include male of S. muehlenhardtae sp. nov. (first male described for genus). Carapace without or with very short rostrum; disto-lateral edges well rounded. Eye rudiments mesially adjoining though not fused, not connected by a membranous integument, each reduced to roughly rectangular pad; lateral margin distally with one tooth-like non-sensory projection, no visual elements, no ocular papilla. Antennular trunk with three segments separated by transverse or slightly oblique articulations; basal segment without ventral carina. Antennal scale not subdivided, its bare lateral margin ending in a single, strong tooth; mesial margin setose all along. Antennal peduncle with three segments lined in a single plane. Clypeus with unpaired, anterior process. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Endopod 3 with oblique articulation between carpus and propodus. Marsupium formed by three pairs of well-developed oostegites. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod. Endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with small, setose pseudobranchial lobe. Both rami of uropods undivided, setose all around. Telson trapeziform, distally converging, terminally truncate. Spines densely set all along terminal margin and along distal half up to almost entire lateral margins. Terminal margin with pair of small paramedian spines on each side flanked by large spines continuously increasing in length laterally, leaving a characteristic triangular spine-free portion between left and right spine series; no setae.</p><p>Species included</p><p>– S. japonicus Murano, 1974 from the NW Pacific: off Japan, 35– 41° N, 138– 144° E, depth 570– 2055 m (Murano 1974a; Fukuoka 2009)</p><p>– S. muehlenhardtae sp. nov. from the Southern Ocean: Drake Passage and Powell Basin, 59– 62° S, 47– 61° W, depth 1993–2920 m</p><p>Remarks</p><p>Pseudomma oculospinum W.M. Tattersall, 1951, based on eye morphology, was acknowledged by Wittmann et al. (2014) as pertaining to the genus Pseudomma rather than to Scolamblyops as proposed by Murano (1974a).</p></div>	https://treatment.plazi.org/id/EF7B8639FF85FFE7FDFD06E9FE6927A3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF86FFEFFD9505D8FD6B23FF.text	EF7B8639FF86FFEFFD9505D8FD6B23FF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Scolamblyops muehlenhardtae Wittmann 2024	<div><p>Scolamblyops muehlenhardtae sp. nov.</p><p>urn:lsid:zoobank.org:act: E52C7FCF-C335-468C-ABF5-D50EF34E8649</p><p>Figs 45–49</p><p>Diagnosis</p><p>Based on adults of both sexes. Covers all features of generic diagnosis. Carapace anteriorly with very short, obtuse-angled rostrum with rounded apex. Freely projecting portion of rostrum up to ⅒ length of terminal segment of antennular trunk. Sub-quadrate eye rudiments with disto-lateral process narrowing to a blunt apex, no ocular papilla. Median segment of antennal peduncle four times as long as basal segment. Terminal lobe of antennal scale short, not or only slightly projecting beyond apical tooth. Scale extending one third its length beyond antennular trunk. Clypeus with long hastate unpaired process projecting anteriorly between antennulae up to basal third of terminal segment of antennular trunk. Labrum with short, tooth-like, rostral projection. Thoracic sternites 2–8 each with one median process in adult male, none in adult female. Marsupium with three pairs of oostegites. Penes short, stout. Female pleopods increasing in length caudally. Endopods of male pleopods 1–5 with 1, 11, 12, 12–13 and 11 segments, exopods with 13, 13, 13, 13 and 12 segments, respectively; no modified setae. Uropods without spine; exopod extending ⅓ its length beyond telson. Distal ⅚ of telson densely furnished with spines along lateral and terminal margins; transversely truncate terminal margin with pair of minute paramedian spines flanked by 5–6 pairs of large spines continuously increasing in length laterally, no setae. Telson with total of 52–74 spines, no laminae, no setae.</p><p>Etymology</p><p>The species name is a noun in genitive singular with feminine ending, dedicated to Ute Mühlenhardt-Siegel (Hamburg) in recognition of her important contributions to peracarid taxonomy and biogeography.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ov. ♀ (BL = 20.1 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.7425&amp;materialsCitation.latitude=-61.725666" title="Search Plazi for locations around (long -60.7425/lat -61.725666)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 114-4; 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W; depth 2914– 2920 m; 18 Feb. 2002; EBS epinet; ZMH 64686.</p><p>Paratypes SOUTHERN OCEAN • 1 ♂ ad. (BL = 16.5 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-58.863834&amp;materialsCitation.latitude=-61.404335" title="Search Plazi for locations around (long -58.863834/lat -61.404335)">Drake Passage</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-58.863834&amp;materialsCitation.latitude=-61.404335" title="Search Plazi for locations around (long -58.863834/lat -61.404335)">N of South Shetland Islands</a>, ANDEEP-I station 105-7; 61°24.16ʹ S, 58°51.55ʹ W to 61°24.26ʹ S, 58°51.83ʹ W; depth 2297.9– 2307.5 m; 12 Feb. 2002; EBS supranet; ZMH 64688 • 1 juv. (BL = 5.3 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.0665&amp;materialsCitation.latitude=-59.373333" title="Search Plazi for locations around (long -60.0665/lat -59.373333)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 041-3; 59°22.24ʹ S, 60°04.06ʹ W to 59°22.40ʹ S, 60°03.99ʹ W; depth 2375– 2372 m; 26 Jan. 2002; EBS epinet; ZMH 64687 • 1 juv. (BL = 6.0 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.469833&amp;materialsCitation.latitude=-61.8095" title="Search Plazi for locations around (long -47.469833/lat -61.8095)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 150-6; 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W; depth 1996– 1993 m; 20 Mar. 2005; EBS epinet; ZMH 64689 .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP I station 114-4: Drake Passage, N of South Shetland Islands, 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W, depth 2914–2920 m. This species is only known from the Drake Passage and Powell Basin, total ranges of 59– 62° S, 47– 61° W, depth 1993–2920 m.</p><p>Description</p><p>Holotype (♀)</p><p>All female features as in specific diagnosis. Female with BL 20.1 mm carrying 16 eggs with diameter 0.73–0.80 mm. Rostrum contributes 1% to BL, thorax 29%, pleon 51%, telson 19% and carapace without rostrum 27%. Carapace with smooth surface (Fig. 46D), no pores detected. Eye rudiments without pigment; tooth-like rostral process 7–9% of eye length (Fig. 46D). Rostral process of clypeus spit-like in dorsal view (as in Fig. 45D), while blade-like with distally converging margins in lateral view (as in Fig. 46C). Blade with only one minute subapical tooth, less than in adult male paratype (Fig. 46C).</p><p>ANTENNULA (Fig. 46A). Trunk not dorsoventrally compressed. Basal segment with disto-lateral, setose lobe extending beyond proximal half of median segment; distinct antennular bursa. Each segment about mid-dorsally near distal margin with setose apophysis (lobe), basal segment with additional, small dorsal apophysis. Segmental border between median and terminal segment slightly oblique in dorsal as well as lateral view. Terminal segment without female lobe; disto-median lobe armed with one comparatively large tooth and four barbed setae. Basal portion of lateral flagellum 1.5–1.7 times as wide as in mesial flagellum.</p><p>ANTENNA (Fig. 46B). Two-segmented sympod with a strong tooth (dashed line in Fig. 46B) dorsally above basis of scale, and another less strong tooth (solid line) ventrally shortly behind scale, accompanied by additional tooth near disto-lateral edge of sympod. Peduncle 3-segmented, its basal segment contributes 13%, median segment 52% and terminal segment 36% to total length. Basal segment bare; median segment setose on distal third of mesial margin; terminal segment setose all along mesial margin.</p><p>PRIMARY MOUTHPARTS (Figs 46E–H, 48A). Labrum and labium as in Figs 46H, 48A. Mandibular palp with basal segment contributing 7%, median segment 60% and terminal segment 33% to total palp length. Palp not hispid, its basal segment without setae. Length of median segment three times maximum width, its mesial margin convex, lateral margin sigmoid, mesial and lateral margins well setose. Terminal segment 4–5 times as long as broad and half as long as median segment. Terminal segment without seta on mesial margin, while comparatively sparsely setose along proximal ⅔ of lateral margin, though with dense series of short microserrated setae on distal third. Pars incisiva of right mandible (Fig. 46G) with four large teeth, digitus mobilis with only two large teeth, each serrated by small secondary teeth. Pars centralis modified, with strong tooth-like spine bearing many acute, stiff bristles proximally followed by dense series of eight subequal subtriangular spines, in part smooth, in part bearing a few stiff bristles. Processus molaris with large masticatory plate formed by densely set cuticular lamellae. Left mandible (Fig. 46F) normal, pars incisiva and digitus mobilis each with four large, blunt teeth. Pars centralis with six slender spines each bearing stiff, acute bristles. Processus molaris with strong but fewer grinding lamellae compared to right mandible. Processus molaris of both mandibles with bundles of long bristles on proximal margin.</p><p>GUT (Fig. 47). Gross structure of foregut normal (Fig. 47A). Lateralia with brushes of slender, proximally smooth, apically coronate spines (Fig. 47B) of various length, and with slender, apically pronged spines (Fig. 47C) densely coated with minute teeth along at least distal ⅔ of shaft. Posterior part of lateralia with dense cluster of four toothed spines of various size (Fig. 47D). Dorsolateral infoldings on each side with a pair of large spines, unilaterally strongly serrated along distal ⅔ (Fig. 47E). Storage volume full with food material (removed on right in Fig. 47A) including masticated organic material, crustacean remains, diatoms and mineral particles. Midgut densely filled with finely masticated material. Anal lobe distinct, weakly cuticularized (dashed lines in Fig. 49K).</p><p>MAXILLULA (Fig. 48B). Distal segment with 10–11 strong, smooth spines on transverse terminal margin. This segment subterminally with three densely set setae bearing long stiff barbs; no pores close to these setae. Lateral margin of basal segment furnished with longitudinal, comparatively long series of densely set long, fine hairs. Endite terminally with three large, distally spiny (by stiff bristles) setae, in between and more dorsally (on left in Fig. 48B) with four more slender, shorter setae of that kind decreasing in size proximally. Ventral margin with seven barbed setae also decreasing in size proximally. Distal half of endite in addition with 13 smooth setae.</p><p>MAXILLA (Fig. 48C). Sympod with three mesial, only distally strongly setose lobes plus a less conspicuous more proximal lobe. The latter with field of acute triangular scales (Fig. 45E) on rostral face. Exopod extends shortly beyond basal segment of palp. Exopod with numerous plumose setae all along lateral margin; apical seta longest; no seta on mesial margin except for a medium-sized seta close to disto-mesial edge. Palp with two subequal segments. Basal segment with three barbed, basally thick setae (below drawing plane, visualized by dashed lines in Fig. 48C). Terminally rounded distal segment 1.7 times as long as maximum width; densely setose on distal 5/9, remaining basal portion bare; no spines.</p><p>THORACIC STERNITES (Fig. 48D). Sternite 1 with the usual median lobe contributing to caudal closure of mouth field, no additional median processes, no setae. Sternites 2–8 with groups of 2–5 barbed setae on intersegmental joint with each thoracic sympod, no median processes. Within groups, lateral setae mostly shorter though with longer, more densely set cils compared to setae in more mesial position (Fig. 48F).</p><p>THORACOPODS (Figs 45A, 48D–E, I–K, 49A–B). Basal plates of exopods 1 and 8 comparatively slender (Fig. 48D); relative width increasing from exopods 1 to 3 and decreasing from 3 to 8. Disto-lateral edge of basal plate in all exopods with tooth-like projection (Fig. 48D). Flagellum of exopods 1 and 8 with 12 segments, flagella 2–7 with 13. Basis of endopod 1 with setose endite (below drawing plane, visualized with dashed lines in Fig. 48D), remaining segments without endite. Endopod 1 strongly setose along mesial margin; disto-lateral edge of basis produced in an acute tooth; lateral margin of basis and ischium without setae; smooth apical nail (Fig. 48E) about as long as propodus. Epipod 1 linguiform (somewhat distorted in Fig. 48D), about as long as combined basis, ischium and merus of endopod 1, no seta. Endopods 1–2 with six segments including basal segment, this last fused with sympod. Endopod 2 with ischium and dactylus strongly setose, remaining segments sparsely setose; dactylus reflexed (Fig. 48I–J), nail smooth, comparatively stout (Fig. 48J). Endopod 2 without endite. Endopod 3 with eight segments (Fig. 49A); its carpopropodus 3-segmented; strongly oblique suture between carpus and 2-segmented propodus; transverse suture between two propodal segments; dactylus slender, hidden in dense brush of setae. Dactyli 1–3 with weakly bent, smooth nail (Figs 48E, J, 49B). Endopods 4–8 broken.</p><p>MARSUPIUM (Fig. 48K). Oostegites 1–3 with smooth surface not considering setae; basally with great numbers of setae microserrated by minute acute bristles; no spiniform setae. Dorsal margin of oostegite 1 with tiny hairs along subbasal to apical portions; corresponding stretch bare along ventral margin. Apical portions of oostegite 1 in addition with a few barbed setae. Dorsal margin of oostegite 2 with tiny hairs along subbasal to subapical portions. Distal third of dorsal margin and distal ¾ of ventral margin with dense series of plumose setae; plumose aspect of setae increasing rostrally. Outer face of oostegite 2 with a few short smooth setae. Oostegite 3 with more such setae loosely scattered over outer face. Dorsal margin mostly bare along subbasal to subapical portions. Posterior and ventral (mesial) margins densely furnished with plumose setae interlocking with setae of opposite oostegite.</p><p>PLEON (Figs 45A, 49G–I). Pleomeres 1–5 each 0.6 times as long as pleomere 6; this value 1.1 for telson. Scutellum paracaudale triangular with acute apex. Pleopods 1–5 short, increasing in length caudally. Each pleopod widening from basis to roughly ⅔ total length; followed by more slender, straight distal portion. Relative width of distal portion decreasing from pleopod 1 to 5. Setation as in Fig. 49G–I.</p><p>TAIL FAN (Fig. 49J–M). Statoliths composed of fluorite, diameter 0.13–0.16 mm (n = 2). Telson (Fig. 49K–M) with total of 74 spines, including 30 spines of various size on each lateral margin, no pores and no scales detected. Each margin with basal 24 lateral spines slightly discontinuously, weakly increasing in size distally, adjoining six lateral spines strongly increasing distally. Transverse terminal margin with pair of minute paramedian spines flanked by six large spines on each side. Most terminal spines smooth, a few rugged due to minute bristles (Fig. 49M) along subbasal to submedian portions.</p><p>Paratype (♂)</p><p>All male features as in specific diagnosis. Body length 16.5 mm. Rostrum contributes 1% to BL, thorax 30%, pleon 53%, telson 16% and carapace without rostrum 28%. Appendix masculina well developed.</p><p>THORAX (Fig. 48G–H). Each thoracic sternite with one sub-conical to pyriform median process (Fig. 48G). Distal ⅗–⅘ of processes with acute triangular scales (Fig. 48H) increasing in numbers while decreasing in size towards tip. Average size and structure of scales about same as on sympod of maxilla (Fig. 45E). Sternites 2–8 with groups of 2–6 barbed setae (Fig. 48G) on intersegmental joint with respective thoracic sympod; structure of setae as in holotype (Fig. 48F). Penes (Fig. 48G) short, sub-conical, stouter than sternal processes. Penes apically trilobate, with two subapical and six apical, short setae.</p><p>PLEON (Figs 45B, 49C–F). Pleomeres 1–5 are 0.5, 0.4, 0.4, 0.4 and 0.5 times as long as pleomere 6, respectively; this value 1.0 for telson. Exopod of pleopods 1–5 and endopods 2–5 subequal (Fig. 49C–D, F), endopod 1 (Fig. 49C) much shorter, unsegmented. All sympods sub-quadrate, without setae. Sympod 2 larger than remaining sympods. All pseudobranchial lobes, entire endopod 1, basal ¼ of endopods 2–5 and all exopods with barbed setae. Distal ¾ of endopods 2–5 and all exopods with on average shorter, smooth setae. These setae slightly modified (thicker) on distal six segments of endopod 4, two setae of that type per segment (Fig. 49E). Compared with modified setae on endopod 4 of Amphiakrops brandtae gen. et sp. nov. (Fig. 61D), corresponding setae of S. muehlenhardtae sp. nov. (Fig. 49E) thinner and not overlapping like roofing tiles.</p><p>TAIL FAN (Figs 45B, 49N). Telson with total of 52 spines, including 19–21 spines of various sizes on lateral margins, no pores detected. Each lateral margin with 18–20 spines somewhat discontinuously increasing in size distally. Transverse terminal margin with pair of minute paramedian spines flanked by five pairs of larger spines continuously increasing in size laterally. Terminal spines rugged due to minute bristles (Fig. 49N) along subbasal to subapical portions; clearly with more and larger bristles compared with those of female holotype (Fig. 49M).</p></div>	https://treatment.plazi.org/id/EF7B8639FF86FFEFFD9505D8FD6B23FF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF8EFFEEFE410195FD852590.text	EF7B8639FF8EFFEEFE410195FD852590.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stellamblyops Petryashov & Frutos 2017	<div><p>Genus Stellamblyops Petryashov &amp; Frutos, 2017</p><p>Stellamblyops Petryashov &amp; Frutos, 2017: 405 .</p><p>Stellamblyops – Mees &amp; Meland 2024: AphiaID 1246750 (accepted).</p><p>Type species</p><p>Stellamblyops vassilenkoae Petryashov &amp; Frutos, 2017, by original designation.</p><p>Revised diagnosis</p><p>Diagnosis by Petryashov &amp; Frutos (2017) based on both sexes, here revised for inclusion of S. doryphorus sp. nov. Eye rudiments separate, without stalks, positioned laterally, not connected by membranous integument, each reduced to roughly triangular pad with tooth-like, non-sensory distal projection extending beyond median segment of antennular trunk; visual elements strongly reduced, no ocular papilla. Antennular trunk 3-segmented; weakly oblique articulation between median and terminal segment. Antennal scale with bare lateral margin and setose mesial margin. Antennal peduncle with three segments lined in a single plane and separated by transverse articulations. Clypeus with long, unpaired anterior process. Labrum normal, without spiniform rostral process. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod. Endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with small pseudobranchial lobe. Uropods undivided, setose. Telson elongate linguiform with lateral constriction, minimum width at about ⅓ of length from terminus. Telson mid-terminally with small rounded indentation or with distinct, proximally rounded cleft, in any case lined with small laminae and flanked by large spines, no setae; terminal spines with size not increasing in continuous series laterally.</p><p>Species included</p><p>– S. vassilenkoae Petryashov &amp; Frutos, 2017 from the NW Pacific: Kurile-Kamchatka Trench area, Kurile Basin of the Sea of Okhotsk, 41– 46° N, 151– 157° E, depth 3371–5429 m (Petryashov &amp; Frutos 2017)</p><p>– S. doryphorus sp. nov. from the Southern Ocean: Weddell Abyssal Plain, Drake Passage, 59– 67° S, 0– 60° W, depth 2372–4678 m</p></div>	https://treatment.plazi.org/id/EF7B8639FF8EFFEEFE410195FD852590	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FF8FFFD4FDF607BFFC4B23A2.text	EF7B8639FF8FFFD4FDF607BFFC4B23A2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Stellamblyops doryphorus Wittmann 2024	<div><p>Stellamblyops doryphorus sp. nov.</p><p>urn:lsid:zoobank.org:act: D6415EFD-FF66-4C08-8041-910A2B7AC5F6</p><p>Figs 50–53</p><p>Diagnosis</p><p>Based on subadult females only. All features matching generic diagnosis. Rostrum triangular, short, not reaching beyond proximal half of basal segment of antennular trunk. Eye rudiments elongate tearshaped with finger-like distal process extending beyond median segment of antennular trunk. Eyes disto-laterally positioned, dorsoventrally weakly flattened, near basis 1.3–1.5 times as wide as thick; basis inside with bulbous, well-delimited corneal rudiment containing numerous reduced ommatidia not reaching surface. Antennular trunk without ventral carina. Antennal sympod with three teeth near insertion of scale. Antennal scale extending far beyond antennular trunk (tip of scale unknown). Clypeus with strong median process extending to second segment of antennular trunk or beyond. Rostral margin of labrum triangular with blunt tip. Female pleopods 3–4 rod-like, with residual differentiation of pseudobranchial lobe. Uropods without spine. Telson elongate linguiform, waisted, with minimum width at ⅓ of length from terminus. Lateral margins with spines along distal ⅔; spines increasing in length distally. Mid-terminal notch with four small laminae (toothlets) flanked by three pairs of spines, also larger than disto-lateral spines. Telson with total of ≈ 40 spines and four laminae, no setae.</p><p>Etymology</p><p>The species name is the transliterated Ancient Greek adjective ‘δορυφόρος’ (‘spear-bearing’) with Latinized masculine ending, related to the large rostral process of the clypeus.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ subad. (BL = 8.1 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-0.0365&amp;materialsCitation.latitude=-67.4935" title="Search Plazi for locations around (long -0.0365/lat -67.4935)">eastern Weddell Abyssal Plain</a>, S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet; ZMH 64690.</p><p>Paratypes SOUTHERN OCEAN • 1 juv. (BL = 4.8 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-43.015167&amp;materialsCitation.latitude=-64.9995" title="Search Plazi for locations around (long -43.015167/lat -64.9995)">northern Weddell Abyssal Plain</a>, ANDEEP-II station 135-4; 65°00.06ʹ S, 43°01.19ʹ W to 64°59.97ʹ S, 43°00.91ʹ W; depth 4677.6–4678.2 m; 11 Mar. 2002; EBS supranet; ZMH 64692 • 1 ♀ subad. (tailfan broken, estimated BL ≈ 8.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.0665&amp;materialsCitation.latitude=-59.373333" title="Search Plazi for locations around (long -60.0665/lat -59.373333)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 041-3; 59°22.24ʹ S, 60°04.06ʹ W to 59°22.40ʹ S, 60°03.99ʹ W; depth 2375– 2372 m; 26 Jan. 2002; EBS epinet; ZMH 64691 .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP III station 059-5: eastern Weddell Abyssal Plain, S of Maud Rise and E of Sanae Canyon, 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W, depth 4655 m. This species was also recorded in the deep waters of the Drake Passage. Total ranges 59° S – 67° S, 00°– 60° W, depth 2372–4678 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features as in specific diagnosis. Body length 8.1 mm. Rostrum contributes 2% to BL, carapace without rostrum 31%, thorax 34%, pleon 44% and telson 20%. Rostrum right-angled triangular with acute tip (Fig. 51B). Disto-lateral edges of carapace with small, tooth-like projection (Fig. 51B). Most of carapace surface ornamented by minute depressions as in Fig. 50D, no pores detected. Eye rudiments without pigment; long rostral process extending to distal segment of antennular trunk (Fig. 50A–B); no pores, no organ of Bellonci. Rostral process of clypeus (Fig. 50B) spit-like in dorsal view, blade-like with distally converging margins in lateral view.</p><p>ANTENNULA (Fig. 50A–B). Trunk dorsoventrally compressed with distally decreasing thickness (Fig. 50A), basal segment 1.4 times as wide as thick, terminal segment 2.4 times. Terminal segment of left and right trunks with artificial transverse fold (not present in paratypes) feigning an additional segmentation in Fig. 50A–B. Basal segment with disto-lateral, setose lobe extending beyond proximal half of median segment. No antennular bursa detected. Segmental border between median and terminal segment oblique in dorsal view, to a minor degree also in lateral view; distal portion of median segment dorsally overlapping part of terminal segment. Terminal segment with four barbed setae on disto-median lobe, no tooth. Basal portions of both flagella with about same width.</p><p>ANTENNA (Fig. 51A). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Sympod with a strong tooth (dashed line in Fig. 51A) dorsally above basis of scale, another strong tooth (solid line) proximally accompanied by smaller tooth ventrally near disto-lateral edge of sympod. Peduncle 3-segmented, its basal segment contributes 14%, median segment 49% and terminal segment 37% to total length. Basal segment bare, median and terminal segments each with a few barbed setae near distal margin.</p><p>PRIMARY MOUTHPARTS (Figs 51C–E, 53A–B). Labrum and labium normal (Fig. 53A–B). Mandibular palp (Fig. 51C) with basal segment contributing 6%, median segment 62% and terminal segment 32% to total palp length. Palp not hispid, its basal segment without setae. Length of median segment four times maximum width, its mesial margin convex, lateral margin sigmoid, densely setose along mesial and lateral margins. Terminal segment seven times as long as broad and 0.6 times as long as median segment. Terminal segment comparatively sparsely setose along lateral margins, though with dense series of short microserrated setae on tip. Right mandible (Fig. 51D) with four large teeth on pars incisiva and with only two large teeth, each serrated by small secondary teeth, on digitus mobilis. Pars centralis modified, with distally serrated, broad tooth-like spines proximally followed by continuous series of nine smooth, subtriangular spines decreasing in size proximally. Processus molaris also modified, with series of 13 teeth, median teeth longest. Left mandible (Fig. 51E) almost normal, pars incisiva with three large teeth, digitus mobilis with five large, blunt, distal processes (one of which below drawing plane in Fig. 51E). Pars centralis with seven slender spines bearing stiff bristles. Processus molaris with strong grinding lamellae not ending in teeth. Processus molaris of left mandible with bundle of stiff bristles on proximal edge. Right mandible with such a bundle on lateral margin of processus molaris.</p><p>GUT (Fig. 52). Foregut, not considering its artificial deformation (Fig. 52A), most similar to that of Scolamblyops muehlenhardtae sp. nov. (Fig. 47). Posterior part of lateralia (accidentally shifted caudally) in Stellamblyops doryphorus sp. nov. with complex of at least eight toothed spines of various sizes (Fig. 52D; potential additional spines poorly differentiated due to superposition in optical path. Dissected foregut with almost empty storage volume, midgut completely filled with finely masticated material. Anal lobe distinct, weakly cuticularized.</p><p>MAXILLULA (Fig. 51F–G). Distal segment with eleven strong spines on transverse terminal margin; most distal spine smooth, remaining spines unilaterally serrated, armed with acute to blunt micro-teeth (examples in Fig. 51G). This segment subterminally with three setae bearing long stiff barbs. Lateral margin of basal segment furnished with longitudinal, comparatively long series of densely set, long hairs. Endite terminally with two large, distally spiny (due to stiff bristles) setae flanked by several less strong, shorter setae.</p><p>MAXILLA (Fig. 51H). Sympod with three mesial, only distally strongly setose lobes. Additional mesial bulge short, not clearly classified as lobe. Exopod extends shortly beyond basal segment of palp. Exopod with numerous plumose setae all along lateral margin; tip with two large plumose setae almost twice as long as largest lateral setae, mesial margin bare. Palp with two subequal segments. Apical segment 1.6 times as long as maximum width. Basal segment less wide, bearing two barbed, basally thick setae (below drawing plane, visualized by dashed lines in Fig. 51H). Obliquely transverse distal margin of apical segment densely setose, lateral margin with only four barbed setae, mesial margin bare, no spines.</p><p>THORACOPODS (Fig. 53C–F). Basal plates of thoracic exopods 1–2 and 8 slender, disto-lateral edge with tooth-like projection (Fig. 53E); remaining exopods broken. Flagellum of exopod 1 with ten segments, exopods 2 and 8 each with eleven. Basis of thoracic endopod 1 with setose endite (mostly below drawing plane in Fig. 53C), remaining segments without endite. Endopod 1 strongly setose along mesial margin; merus and carpus without setae on lateral margin; smooth apical nail (Fig. 53D) slightly longer than propodus. Epipod 1 linguiform, only about as long as carpus of endopod 1, no seta. Endopod 2 (Fig. 53E) with six segments including basal segment, the latter fused with sympod; ischium and dactylus strongly setose, remaining segments sparsely setose; dactylus not reflexed, nail smooth, slender (tip of nail broken, Fig. 53F); no endite. Thoracic endopods 3–8 broken.</p><p>PLEON AND TAIL FAN (Fig. 53G–I). Pleomeres 1–5 are 0.5, 0.5, 0.5, 0.5 and 0.7 times as long as pleomere 6, respectively; this value 1.7 for telson. Subadult female pleopods 3–4 short, distally widening, with setation as in Fig. 53G; remaining pleopods broken. Uropods with setose lateral margins, no spines, but tips of all available uropods broken. Statoliths not preserved. Telson (Fig. 53H) with total of 40 spines, including 17 spines on each lateral margin, 2×3 large, in part (artificially?) limp spines on transverse terminal margin; no pores and no scales detected. Notch with pair of small paramedian laminae flanked by a pair of even smaller laminae.</p><p>Paratypes</p><p>Carapace length about one third of BL. Antennular trunk clearly 3-segmented, terminal segment without artificial fold in both paratypes (unlike holotype in Fig. 50B).</p></div>	https://treatment.plazi.org/id/EF7B8639FF8FFFD4FDF607BFFC4B23A2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFB5FFD7FD3001A6FC9A2423.text	EF7B8639FFB5FFD7FD3001A6FC9A2423.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Schizurakrops Wittmann 2024	<div><p>Schizurakrops gen. nov.</p><p>urn:lsid:zoobank.org:act: 4AF77738-BAF1-4A19-BFDC-D735B03FBAD5</p><p>Type species</p><p>Schizurakrops meesi gen. et sp. nov. by monotypy and present designation.</p><p>Diagnosis</p><p>Based on adult female. Carapace anteriorly produced into large, spearhead-like rostrum. Eye rudiments set apart, not connected by membranous integument; dorsoventrally strongly flattened, with one acute distal projection from disto-lateral edge, no visual elements, no ocular papilla. Three segments of the antennular trunk separated by transverse articulations. Antennal peduncle with three segments lined in a single plane. Antennal scale not subdivided, without terminal lobe; mesial margin setose; bare portion of lateral margin ending in a single, strong tooth. Clypeus with unpaired median, blade-like anterior process. Labrum normal, anteriorly rounded; no longitudinal ridge. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Three pairs of oostegites contributing to wall of marsupium. Female pleopods reduced to setose rods with residual differentiation of pseudobranchial lobe. Uropods undivided, setose. Telson elongate, roughly trapeziform, with deep apical incision lined with laminae, no seta. Disto-lateral lobes with spines on narrowly transverse terminal margin.</p><p>Etymology</p><p>The genus name is a noun with Greek masculine ending, condensed from the Ancient Greek verb ‘σχίζω’ (‘divide’), noun ‘οὐρά’ (‘tail’), adjective ‘άκρος’ (‘acute’) and noun ‘ὤψ’ (‘eye’), referring to the cleft telson in combination with rostrally acute eye rudiments.</p></div>	https://treatment.plazi.org/id/EF7B8639FFB5FFD7FD3001A6FC9A2423	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFB6FFDDFDFB0651FAED25E2.text	EF7B8639FFB6FFDDFDFB0651FAED25E2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Schizurakrops meesi Wittmann 2024	<div><p>Schizurakrops meesi gen. et sp. nov.</p><p>urn:lsid:zoobank.org:act: A99E05AD-A910-483E-B6EE-B03FB5C839DE</p><p>Figs 54–57</p><p>Diagnosis</p><p>Based on adult female only. All features as in generic diagnosis. Rostrum reaching beyond antennal scale. Eye rudiments with strong tooth-like anterior projection extending beyond basal segment of antennular trunk; this segment without ventral carina. Antennal sympod with three teeth near disto-lateral edge; median segment of peduncle five times as long as basal segment; scale length four times as long as maximum width. Blade-like extension of clypeus proceeds anteriorly between antennae up to end of second segment of antennular trunk. Uropods without spine. Telson trapezoid not considering terminal incision. Terminal incision ⅐ of telson length, lined all along with densely-set, slender laminae. Lateral margins distally converging; basal 3/10 bare except for small stand-alone spine at ⅕ of telson length from basis; distal 7/10 with discontinuous series of large spines with 1–2 small spines in between; large spines increasing in length distally. Each disto-lateral lobe with two spines, outer spine ⅔ length of incision, inner spine ⅓. Telson with total of ≈ 34 spines and ≈ 35 laminae, no setae.</p><p>Etymology</p><p>The species name is a noun with Latinized masculine ending in genitive singular, dedicated to Jan Mees in recognition of his important contributions to the taxonomy and ecology of mysids.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ov. ♀ ad. (BL = 13.8 mm, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.469833&amp;materialsCitation.latitude=-61.8095" title="Search Plazi for locations around (long -47.469833/lat -61.8095)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 150-6; 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W; depth 1996– 1993 m; 20 Mar. 2005; EBS epinet; ZMH 64685.</p><p>Type locality</p><p>The type locality is ANDEEP III station 150-6: Powell Basin, SW continental slope of South Orkney Islands, 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W, depth 1996– 1993 m.</p><p>Description</p><p>Holotype (♀)</p><p>All features as in specific diagnosis. Female with BL 13.8 mm carried eleven eggs with a diameter 0.64–0.67 mm. Rostrum contributing 11% to BL, carapace 26% (without rostrum), thorax 29%, pleon 44% and telson 16%. Carapace with smooth surface, disto-lateral edges well rounded (Fig. 55D), no pores. Eye rudiments (Fig. 55A) dorsoventrally compressed by a factor of 4.7, without pigment, no pores, no organ of Bellonci.</p><p>ANTENNULA (Figs 54A, 55A). Basal segment of trunk with disto-lateral, setose lobe extending beyond proximal half of median segment. Basal and median segments each with dorsal apophysis bearing a few setae on tip. Terminal segment about as long as combined median and basal segments (not counting apophyses). Terminal segment with disto-median lobe armed with three barbed setae and with three teeth, teeth increasing in length laterally (as in Fig. 33C). Basal portion of mesial flagellum 0.8 times as wide as base of lateral flagellum.</p><p>ANTENNA (Fig. 55B). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Sympod with two strong teeth, one above and one below basis of antennal scale, a third strong tooth on disto-lateral edge; distally rounded, linguiform lobe mesially positioned near peduncle. Peduncle 3-segmented, its basal segment contributing 11%, median segment 60% and terminal segment 30% to total length. Basal segment bare, median segment with a few barbed setae near distal margin, terminal segment with a few setae on distal, mesial and lateral margins.</p><p>PRIMARY MOUTHPARTS (Fig. 55E–I). Labrum and labium normal (Fig. 55E, I). Mandibular palp (Fig. 55F) with basal segment contributing 9%, median segment 59% and terminal segment 32% to total palp length. Palp not hispid, its basal segment without setae, median segment setose along both margins. Length of median segment 2.6 maximum width, its mesial margin convex, lateral margin sigmoid. Terminal segment 3.7 times as long as broad and 0.6 times as long as median segment. Terminal segment well setose, with dense series of short microserrated setae on distal ⅖ of lateral margin. Right mandible (Fig. 55H) with three large teeth on pars incisiva and with only two smooth blunt teeth on small digitus mobilis. Pars centralis modified, with continuous series of 13 smooth, subtriangular, tooth-like spines, proximally (with respect to mouth field) decreasing in basal width rather than length. Processus molaris with most masticatory lamellae bearing small teeth. Left mandible (Fig. 55G) essentially as in most Mysidae, pars incisiva with three large teeth, digitus mobilis with one large plus five small, blunt, distal processes. Pars centralis with six slender spines bearing stiff bristles. Processus molaris with strong grinding lamellae, and with minute teeth on and close to proximal edge. Processus molaris of both mandibles with bundle of stiff bristles on ventro-lateral edge (distally with respect to mouth field).</p><p>GUT (Fig. 56). Foregut with normal gross structure. Spines similar to those of Stellamblyops doryphorus sp. nov. (Fig. 52). Lateralia of Schizurakrops meesi gen. et sp. nov. with dense series of slender, apically pronged spines (Fig. 56B 1 –B 2) coated with tiny teeth along most of shaft. Lateralia also with slender, seta-like spines (Fig. 56C) coated with micro-teeth most densely along distal half. Posterior part of lateralia with complex of about ten serrated (toothed) spines of various sizes (Fig. 56D). Dorsolateral infoldings on each side with three larger spines, unilaterally serrated on ⅕ to ⅔ of length from basis (Fig. 56E). Three large toothed spines (Fig. 56F) at half foregut length to the right appear not fixed to foregut and show no counterparts to the left; their affiliation with S. meesi appears unclear (extraneous origin not excluded). Foregut with almost full storage volume containing great numbers of crustacean remains, also sponge spicules, foraminiferans, masticated organic material and mineral particles. Midgut less densely filled with finely masticated material. Anal lobe distinct, weakly cuticularized (dashed line in Fig. 57J).</p><p>MAXILLULA (Fig. 55J–K). Distal segment with 11–12 strong spines on transverse terminal margin; the most distal spine smooth, remaining spines mostly unilaterally, also bilaterally serrated, armed with acute to blunt micro-teeth (examples in Fig. 55K). This segment subterminally with three setae bearing long, stiff barbs. Lateral margin of basal segment furnished with longitudinal, comparatively long series of densely set, long hairs. Endite terminally with three large, distally spiny (by stiff bristles) setae flanked by several less strong, shorter setae.</p><p>MAXILLA. Most similar to that of Stellamblyops doryphorus sp. nov. (Fig. 51H). Sympod with three mesial, only distally strongly setose lobes. Additional mesial protrusion short, not clearly classified as lobe. Exopod extends shortly beyond basal segment of palp. Exopod with numerous plumose setae all along lateral margin; tip with 2–3 large plumose setae almost twice as long as largest lateral setae, mesial margin bare. Palp with two segments subequal in length. Apical segment 1.6 times as long as maximum width. Basal segment less wide, its mesial margin with two barbed, basally thick setae in subbasal position, and with a smaller barbed seta in subterminal position. Distal ⅗ of apical segment with well setose margins, proximal ⅖ bare, no spines.</p><p>THORACOPODS (Fig. 57A–D). Intersegmental joints between sternites and sympods 2 and 5–7 with basally thick, all along barbed seta (Fig. 57C); on sympod 6 accompanied by one smaller seta of that type. Such setae not seen, possibly broken on sympods 3–4 and 8, though expected in analogy to D. benthophilus sp. nov. (Fig. 7H). Basal plates of exopods 2 and 5–6 slender, disto-lateral edge with tooth-like projection (Fig. 57C); flagellum of these exopods with ten segments; remaining exopods broken. Basis of endopod 1 with setose endite (below drawing plane, visualized as dashed line in Fig. 57A), remaining segments without endite. Endopod 1 strongly setose along mesial margin, much less along lateral margin; its smooth apical nail (Fig. 57B) slightly longer than propodus. Epipod 1 (Fig. 57A) linguiform, about as long as combined ischium, merus, and carpus of endopod 1; tip with five minute bristles. Endopod 2 (Fig. 57C) with six segments including basal segment, the latter fused with sympod; ischium and dactylus strongly setose, remaining segments less setose; no endites; dactylus not reflexed, claw (Fig. 57D) smooth, slender, about as long as dactylus. Endopods 3–8 broken.</p><p>MARSUPIUM (Fig. 57E). Oostegites with smooth cuticle on outer and inner faces, not counting setae. Proximal portion of oostegites 1–3 on inner face with 5–8, 8–10 and 10–13 long setae, respectively; setae microserrated by series of stiff, acute bristles along distal half. Oostegite 1 with only two additional, plumose setae near terminus. In contrast, oostegites 2–3 with ventral and anterior margins plus part of posterior margin bearing dense series of setae contributing to ventral and caudal, ventilation-pervious closure of marsupium. Proximal setae smooth but numbers of barbs per seta increase distally, yet not attaining configuration of typical plumose seta. Basal portions of dorsal margin without setae in oostegites 2–3. Only oostegite 3 with numerous slender whip setae loosely scattered over its outer face.</p><p>PLEON AND TAIL FAN (Figs 54A, 57F–K). Pleomeres 1–5 are 0.6, 0.5, 0.6, 0.4 and 0.5 times as long as pleomere 6, respectively (Fig. 54A); this value 1.2–1.3 for exopod of uropods, 1.2 for endopod and 1.4 for telson (telson inserts more rostrally than rami of uropods). Pleopods 1–5 representing distally widening plates bearing narrow digitus on top; setation as in Fig. 57F–H. Pleopod length increasing caudally. Scutellum paracaudale triangular. Statoliths composed of fluorite, diameter only 0.08–0.10 mm (n = 2). Lateral margins of telson (Fig. 57J–K) (almost) straight, no pores or scales detected.</p></div>	https://treatment.plazi.org/id/EF7B8639FFB6FFDDFDFB0651FAED25E2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFBCFFDCFD350066FCEC24E3.text	EF7B8639FFBCFFDCFD350066FCEC24E3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amphiakrops Wittmann 2024	<div><p>Amphiakrops gen. nov.</p><p>urn:lsid:zoobank.org:act: 90554F72-6514-4128-B01D-A0533B775212</p><p>Paramblyops bidigitatus -group – Murano 2002a: 35, table 1.</p><p>Type species</p><p>Amphiakrops brandtae gen. et sp. nov. by present designation.</p><p>Diagnosis</p><p>Eye rudiments without definite stalk; eyes set apart, not connected by membranous integument, both distal edges produced into tooth-like, non-sensory processes, no visual elements, no ocular papilla. Third segment of antennular trunk undivided (divided into two portions in Teratamblyops Murano, 2001). Bare lateral margin of antennal scale ending in a single, strong tooth; mesial margin setose all along. Three segments of antennal peduncle lined in a single plane. Clypeus with rostral process, if present, not strongly elongate. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Marsupium formed by three pairs of well-developed oostegites. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod; endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with setose pseudobranchial lobe; endopod 4 as far as known with modified setae. Both rami of uropods undivided, setose all around (with one spine in currently known species). Telson trapeziform, distally converging, terminally truncate. Spines densely set along distal portions of lateral margins. Terminal margin with pair of paramedian setae and 1–2 small spines, together flanked by several large spines.</p><p>Etymology</p><p>The genus name is a transliterated noun with Greek masculine ending, condensed from the Ancient Greek preposition ‘ἀμφί’ (‘on both sides’) with the adjective ‘άκρος’ (‘acute’) and the noun ‘ὤψ’ (‘eye’), referring to the tooth-like extensions on both sides of each eye rudiment.</p><p>For differences from related genera and for the inclusion of two species of Paramblyops, see ‘Discussion’ below.</p><p>Species included</p><p>– A. bidigitatus (W.M. Tattersall, 1911) comb. nov. (recombined from Paramblyops bidigitata W.M. Tattersall, 1911) from the NE Atlantic: Bay of Biscay, off Ireland, SW of Faroes, Iceland Basin, 44– 64° N, 3– 29° W, depth 976–2900 m (W.M. Tattersall 1911; Tattersall &amp; Tattersall 1951; Mauchline 1982; Lagardère 1985; Petryashov 2014b; Astthorsson &amp; Brattegard 2022)</p><p>– A. japonicus (Murano, 1981) comb. nov. (recombined from Paramblyops japonica Murano, 1981) from the NW Pacific: E of Japan, on sea floor at a depth of 1690 m (plus 0–1250 m recorded with non-closing device), 33– 36° N, 141– 142° E (Murano 1981)</p><p>– A. brandtae gen. et sp. nov. from the Southern Ocean: Weddell Sea, Drake Passage, South Sandwich Trench, 58– 65° S, 25– 61° W, depth 2086–2920 m</p></div>	https://treatment.plazi.org/id/EF7B8639FFBCFFDCFD350066FCEC24E3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFBDFFC5FD890760FCEA21F6.text	EF7B8639FFBDFFC5FD890760FCEA21F6.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amphiakrops brandtae Wittmann 2024	<div><p>Amphiakrops brandtae gen et. sp. nov.</p><p>urn:lsid:zoobank.org:act: 129A500D-3F04-43AF-A2EB-B78CDC5A6A0B</p><p>Figs 58–61</p><p>Diagnosis</p><p>Based on adults of both sexes.All features as in generic diagnosis. Carapace with broadly rounded anterior and disto-lateral margins; rostrum almost non-existent, forming very narrow transverse prolongation of carapace. Eye rudiments dorsoventrally flattened, without visual elements, set apart, with concave anterior and mesial margins, and with weakly convex lateral margin; both anterior corners produced into tooth-like processes.Antennular trunk without mid-ventral carina. Median segment of antennal peduncle 4–5 times as long as basal segment. Antennal scale not subdivided; length three times maximum width. Terminal lobe of scale clearly projecting beyond tooth on lateral margin. Scale extending ⅓–⅔ of its length beyond antennular trunk. Clypeus with unpaired, short triangular rostral process. Labrum normal, with short, broadly rounded to bluntly triangular rostral projection. Thoracomeres 2–8 with unpaired mid-sternal processes in adult male, none in adult female. Marsupium with three pairs of oostegites. Penes short, stout. Female pleopods increasing in length distally; no modified setae. Male pleopods with large quadrangular sympod; endopods 1–5 with 1, 11, 11, 11 and 9 segments, exopods with 11, 11, 11, 11 and 9 segments, respectively; distal half of endopod 4 with longitudinal series of basally thickened smooth setae. Endopod of uropods with single spine below statocyst. Lateral margins of telson straight, moderately converging, proximally bare; distally with (almost) continuous series of about 13–16 spines increasing in length distally. Terminal margin with pair of long, barbed setae in median position, flanked by pair of minute spines, in turn flanked by 3–4 pairs of large spines subequal among each other. Telson with total of ≈36–40 spines and two setae.</p><p>Etymology</p><p>The species name is a noun with feminine ending in genitive singular, dedicated to Angelika Brandt in recognition of her role as leading scientist of the ANDEEP expeditions and of her important contributions to peracarid taxonomy and biogeography.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♂ ad. (BL = 17.5 mm, on slides); NW Weddell Sea, ANDEEP-II station 132-2; 65°17.74ʹ S, 53°22.82ʹ W to 65°17.56ʹ S, 53°22.83ʹ W; depth 2086– 2086 m; 6 Mar. 2002; EBS epinet; ZMH 64667.</p><p>Paratype SOUTHERN OCEAN • 1 ♀ ad. (BL = 23.8 mm, marsupium empty, on slides); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.7425&amp;materialsCitation.latitude=-61.725666" title="Search Plazi for locations around (long -60.7425/lat -61.725666)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 114-4; 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W; depth 2914–2920 m; 18 Feb. 2002; EBS supranet; ZMH 64668 .</p><p>Other material</p><p>SOUTHERN OCEAN • 1 juv. (only cephalothorax); same collection data as for holotype .</p><p>Type locality and distribution</p><p>The type locality is ANDEEP II station 132-2: NW Weddell Sea, 65°17.74ʹ S, 53°22.82ʹ W to 65°17.56ʹ S, 53°22.83ʹ W, depth 2086 m. This species has also been recorded in the deep waters of the Drake Passage. Total ranges 62– 65° S, 53– 61° W, depth 2086–2920 m.</p><p>Description</p><p>Holotype (♂)</p><p>All male features as in specific diagnosis. Body length 17.5 mm. Thorax contributes 37% to BL, pleon 50%, telson 14% and carapace 30%. Crescent-shaped subrostral plate (as in Fig. 59C), 0.1–0.3 times length of terminal segment of antennular trunk. Carapace with smooth surface, anteriorly broadly rounded, no pores detected. Eye rudiments in dorsal view roughly parallelogram-shaped, without pigment; disto-lateral tooth-like process ⅕ of eye length, disto-mesial process ⅒; organ of Bellonci in basal position. Clypeus with short rostral process (Fig. 58C). Labrum with bluntly obtuse-angled rostral projection (Figs 58C, 59D).</p><p>ANTENNULA (Figs 58C, 59A). Trunk dorsoventrally weakly flattened by a factor of 1.2. Basal segment contributes 30%, median segment 14% and terminal segment 55% to total length of antennular trunk. Basal segment with antennular bursa and with disto-lateral, setose lobe extending beyond proximal half of median segment. Each segment about mid-dorsally near distal margin with setose apophysis, basal segment with additional, small dorsal apophysis. Segmental border between median and terminal segments slightly oblique in dorsal as well as lateral view. Terminal segment with disto-median lobe bearing four barbed setae, no tooth. Basal portion of lateral flagellum 1.3 times as wide as in mesial flagellum. Appendix masculina large, 0.1 times BL and 1.2 times length of terminal segment of antennular trunk (Fig. 59A).</p><p>ANTENNA (Fig. 59B). Two-segmented sympod (not considering end sac of antennal gland in Fig. 59B) dorsally with tooth (dashed line in Fig. 59B) above basis of antennal scale and another stronger tooth (solid line) ventrally shortly behind scale, accompanied by additional small tooth near disto-lateral edge of sympod. Peduncle 3-segmented, its basal segment contributes 15%, median segment 61% and terminal segment 24% to its total length. Basal segment bare; median and terminal segments sparsely setose on mesial and lateral margins.</p><p>MANDIBLES (Fig. 59E–G). Palp with basal segment contributing 13%, median segment 56% and terminal segment 31% to total palp length. Palp not hispid, its basal segment without setae, median segment densely setose along lateral and mesial margins. Length of median segment twice maximum width, mesial and lateral margins convex. Terminal segment 3–4 times as long as broad and about half as long as median segment. Terminal segment with great numbers of smooth setae, only its distal fifth with dense series of short, microserrated setae. Pars incisiva of right mandible (Fig. 59F) with four large teeth, digitus mobilis with only two large teeth, each serrated by small secondary teeth. Pars centralis modified, with strong tooth-like spine bearing several acute, stiff bristles. This spine proximally followed by dense series of nine subequal, about triangular, slender tooth-like spines also bearing stiff bristles. Processus molaris with large masticatory plate formed by densely set cuticular lamellae. Left mandible (Fig. 59G) normal, pars incisiva and digitus mobilis each with four large, blunt teeth. Pars centralis with seven slender spines each bearing stiff, acute bristles. Processus molaris with strong but fewer grinding lamellae compared to right mandible. Processus molaris of both mandibles with bundles of long bristles on proximal margin.</p><p>GUT (Fig. 60B–E). Foregut as in Paramblyops petrescui sp. nov. (Fig. 43) except that cluster on posterior part of lateralia contains fewer (four vs six) all along unilaterally more strongly serrated spines (Fig. 60D vs Fig. 43D) and that cluster on dorsolateral infoldings contains fewer (six vs nine), unilaterally more strongly serrated (toothed) spines along distal ⅔ (Fig. 60E vs Fig. 43E). Holotype of A. brandtae gen. et sp. nov. with storage volume ¾ filled with unidentifiable masticated organic material and great numbers of mineral particles. Abundant mineral particles also found in midgut. Anal lobe distinct, weakly cuticularized.</p><p>MAXILLULA (Fig. 59I). Distal segment with 13 strong spines on transverse terminal margin, 10–11 proximal (= oral) spines slightly serrated in median to subapical portions, remaining (distal = aboral) spines smooth. This segment subterminally with three densely set setae bearing long stiff barbs, no pores beneath setae. Basal segment furnished with longitudinal, comparatively long series of densely set long, fine hairs. Endite terminally with three large, distally spiny (by stiff bristles) setae, in between and more orally (to the left in Fig. 59I) with three more slender, shorter setae of that type decreasing in size proximally. Aboral margin with five barbed setae also decreasing in size proximally. Distal half of endite in addition with five smooth setae.</p><p>MAXILLA (Fig. 60A). Sympod with four mesial, only distally strongly setose lobes. Longest seta extends beyond dense fan of barbed setae on proximal lobe, this seta (sub)-apically rugged by stiff bristles. Exopod extends shortly beyond basal segment of palp. Exopod with numerous plumose setae all along lateral margin (position of broken setae indicated by dashed lines in Fig. 60A); two longest setae on apex; no seta on mesial margin except for medium-sized seta at disto-mesial edge. Distal segment of palp terminally rounded, two times as long as maximum width, 1.3 times length of proximal segment. Distal segment densely setose on distal half of mesial margin, remaining portions sparsely setose, no spines. Proximal segment with three barbed setae on rostral face plus 3–4 smaller barbed setae on caudal face (caudal setae visualized by dashed lines in Fig. 60A).</p><p>THORAX (Fig. 60F–H). Sternite 1 (Fig. 60F) with usual median lobe contributing to caudal closure of mouth field, no additional median processes, no setae. Sternites 2–8 (Fig. 60F) each with one triangular, mostly acute median process, surface of process covered by minute, acute triangular scales (as in Fig. 48H). Only sternite 2 on each side with cluster of 2–6 barbed setae (Fig. 60H) on intersegmental joint with sympod 2. Penes (Fig. 60F) short, tube-like, distally trilobate with eight setae.</p><p>THORACOPODS (Fig. 60F–H, J–K). Length of basal plates increases from exopod 2 to exopod 5 and then decreases to exopod 7, plate of exopod 8 as in exopod 7; exopod 1 broken. Ratio of length to maximum width 2.2, 2.1, 1.7, 1.8–1.9, 1.6–1.7, 1.6 and 1.9 in series of plates 2–8. Disto-lateral edge of basal plate in exopods 2–8 with small, tooth-like projection (Fig. 60J). Flagellum of exopods 2–8 with 16, 17, 17–18, 18, 18, 17–18 and 18 segments, respectively. Basis of endopod 1 with setose endite (dashed line in Fig. 60F); no tooth-like process. Endopod 1 strongly setose along mesial margin, much less so along lateral margin; lateral margin of basis and ischium without setae. Weakly curved, smooth apical nail (Fig. 60G) longer than dactylus, though shorter than propodus. Epipod 1 linguiform, about as long as combined ischium, merus and carpus of endopod 1, no seta. Endopods 1–2 with six segments including basal segment, the latter fused with sympod. Endopod 2 with carpopropodus and dactylus strongly setose, remaining segments sparsely setose; dactylus not reflexed, nail smooth, comparatively stout (Fig. 60K); no endite. Endopods 3–8 broken.</p><p>PLEON (Figs 58A, 61B–E). Pleomeres 1–5 are 0.4, 0.5, 0.4, 0.4 and 0.6 times as long as pleomere 6, respectively; this value 1.1 for telson. Sympods of pleopods 1–5 sub-quadrate, without setae (Fig. 61B– C, E). Sympod 2 wider than remaining sympods. Total length increases by ¼ in series from pleopod 1 (Fig. 61B) to pleopod 4; pleopod 5 (Fig. 61E) not in series, about as long as pleopod 2 (Fig. 61C). Pseudobranchial lobes 1–5 and basal ⅓–½ of endopods 2–5, as well as exopods 2–5, with barbed setae. Distal portions of exopods 1–5 and of endopods 2–5 with on average shorter, smooth setae. Only endopod 4 with modified, basally thickened setae (Fig. 61D) on lateral margin of segments 4–10; one such seta per segment, setae of adjoining segments overlapping like roofing tiles. Scutellum paracaudale triangular with acute apex.</p><p>TAIL FAN (Figs 58F, 61I–K). Exopod of uropods (Fig. 61I) extends ¼ of length beyond endopod and half-length beyond telson (in part due to telson inserting more rostrally). Statoliths composed of fluorite, diameter 0.20–0.21 mm (n = 2). Telson length 1.7 times maximum width. Telson with total of 36 spines, including 13–14 spines on each lateral margin (Fig. 61J). Transverse terminal margin with two barbed setae (Fig. 61K), two minute spines and seven large spines; only large spines (Fig. 61J) with furrowed surface (Fig. 58F). Telson without pores or scales.</p><p>Paratype (♀)</p><p>All female features as in specific diagnosis. Body length 23.8 mm. Rostrum contributes 1% to BL, thorax 36%, pleon 49%, telson 14% and carapace without rostrum 33%. Basal segment contributes 32%, median segment 18% and terminal segment 50% to total length of antennular trunk. Terminal segment of antennular trunk without female lobe.</p><p>THORAX (Fig. 58B, 60I). Sternite 1 with usual median lobe contributing to caudal closure of mouth field, no additional median processes; no setae. Sternites 2–8 (Fig. 60I) without median process. Sternite 2 on each side with group of seven barbed setae (structure as in Fig. 60H) on intersegmental joint with sympod 2. Endopods 3–8 broken.</p><p>MARSUPIUM (Figs 58B, 61A). Oostegites 1–3 with smooth surface not counting setae (hairs); basally with many setae microserrated by minute acute bristles; no spiniform setae. Dorsal margin of oostegite 1 (Fig. 61A) with tiny hairs along subbasal to apical portions; no such hairs along ventral margin. Distal half of ventral margin and (sub)-apical portions of dorsal margin with barbed setae. Dorsal margin of oostegite 2 with tiny hairs along subbasal portions. Distal third of dorsal margin and distal ¾ of ventral margin with dense series of plumose setae. Only oostegite 3 with numerous whip setae, widely scattered over outer face. Dorsal margin mostly bare along subbasal to subapical portions. Posterior and ventral (mesial) margins densely furnished with plumose setae interlocking with setae of opposite oostegite.</p><p>PLEON (Figs 58B, 61F–H). Pleomeres 1–5 are 0.5, 0.6, 0.6, 0.6 and 0.5 times as long as pleomere 6, respectively; this value 1.1 for telson. Pleopod size increases caudally. Pleopods 1–3 widening from basis to roughly half-length, then converging up to blunt apex (Fig. 61F–G); pleopods 4–5 with longer, subrectangular basal portion (Fig. 61H). Setation of pleopods as in Fig. 61F, H; most setae broken in pleopod 3 (Fig. 61G).</p><p>TAIL FAN. Exopod of uropods extends 44% of its length beyond telson (in part due to telson inserting more rostrally; Fig. 58B). Endopods with slender spine on mesial margin below statocyst. Statoliths composed of fluorite, diameter 0.16–0.19 mm (n = 2). Telson length 1.8 times maximum width. Each lateral margin with 16 spines. Left half of truncate terminal margin with three large and one minute spine plus one barbed seta, only large spines with furrowed surface; right half of terminus broken. Telson with extrapolated total of 40 spines plus two barbed setae.</p></div>	https://treatment.plazi.org/id/EF7B8639FFBDFFC5FD890760FCEA21F6	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFA5FFC4FD31056EFAEB22F2.text	EF7B8639FFA5FFC4FD31056EFAEB22F2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Chelamblyops Wittmann 2024	<div><p>Chelamblyops gen. nov.</p><p>urn:lsid:zoobank.org:act: FCE3D6CF-C4AC-4697-AAA6-60650293EB3F</p><p>Paramblyops – Birstein &amp; Tchindonova 1970 (partim): 288 (upon species description).</p><p>Type species</p><p>Paramblyops globorostris Birstein &amp; Tchindonova, 1970 by present designation. This species was recorded by Birstein &amp; Tchindonova (1970) from the NE Pacific, Kurile-Kamchatka Trench, 44°17ʹ N, 149°33ʹ E, depth 4690–4720 m. It is here transferred to the new genus as Chelamblyops globorostris (Birstein &amp; Tchindonova, 1970) comb. nov.</p><p>Diagnosis</p><p>Based in modified form on description of two adult females by Birstein &amp; Tchindonova (1970). Eyes not connected, set apart, slender, roughly conical with weakly converging proximal and median portions, each distally strongly converging to an acute mid-apical process. Eyes all along densely packed with visual elements (lacking pigment), no ocular papilla. Antennular trunk with three segments separated by transverse articulations. Antennal scale not subdivided, its bare lateral margin ending in single, strong apical tooth; mesial margin setose all along. Antennal peduncle with three segments lined in a single plane. Labrum with spiniform mid-rostral process. Thoracomeres and pleomeres normal. Thoracic endopod 2 subchelate by dactylus inserting on disto-lateral edge of propodus; from there dactylus mesially bent and reflexed, opposing rugged and setose disto-mesial margin of propodus. Thoracic endopod 8 with carpus separated from 2-segmented propodus by oblique articulation. Both rami of uropods unsegmented, setose all around. Lateral margins of telson basally with small stand-alone spine, at some distance followed by series of less distantly set spines (distal portions of telson unknown).</p><p>Etymology</p><p>The genus name is a noun with Greek masculine ending, formed by amalgamation of the Greek noun ‘χηλή’ (‘pincers’) with the generic name Amblyops, related to the subchelate thoracic endopod 2.</p></div>	https://treatment.plazi.org/id/EF7B8639FFA5FFC4FD31056EFAEB22F2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFA5FFC7FD960120FAAE21E3.text	EF7B8639FFA5FFC7FD960120FAAE21E3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pseudomma antarcticum Zimmer 1914	<div><p>Pseudomma antarcticum Zimmer, 1914</p><p>Pseudomma antarcticum Zimmer, 1914: 89, 389–390, pl. xxiii figs 10–12.</p><p>Pseudomma antarcticum – O.S. Tattersall 1955: 94 (records, Antarctic). — Ledoyer 1990: 41 (record, Weddell Sea). — Brandt et al. 1998: table 1 (biogeography). — Meland 2004: fig. 4, app. 2 (taxonomy, morphology, phylogeny). — Petryashov 2006: 1416 (bathymetric distribution). — Meland &amp; Brattegard 2007: 54–57, figs 7–8 (description, range extension, Iceland Basin). — San Vicente 2010: 48, fig. 37f–g (distribution, Antarctic). — Wittmann &amp; Chevaldonné 2021: 154, 205, table 1, suppl. (distribution, sensory structures, taxonomy, in key). — Astthorsson &amp; Brattegard 2022: 68, fig. 79 (distribution, Iceland Basin). — Mees &amp; Meland 2024: AphiaID 226237 (accepted).</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 imm. (BL = 12.4 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-25.1745&amp;materialsCitation.latitude=-58.7415" title="Search Plazi for locations around (long -25.1745/lat -58.7415)">South Sandwich Trench</a>, SE of Montagu Island, ANDEEP-II station 143-1; 58°44.69ʹ S, 25°10.27ʹ W to 58°44.49ʹ S, 25°10.47ʹ W; depth 773.9– 755.6 m; 25 Mar. 2002; EBS epinet • 1 imm. (BL = 8.0 mm); same collection data as for preceding except for occurrence in supranet • 1 imm. (BL = 12.7 mm), 2 juv.; NW Weddell Sea, ANDEEP-II station 131-3; 65°19.83ʹ S, 51°31.62ʹ W to 65°19.95ʹ S, 51°31.41ʹ W; depth 3049–3050 m; 5 Mar. 2002; EBS epinet • 1 ♀ imm. (BL = 15.8 mm), 1 imm. (BL = 11.5 mm), 8 juv.; same collection data as for preceding • 1 ♂ ad. (BL = 21.2 mm), 1 imm. (BL = 5.8 mm); same collection data as for preceding except for occurrence in supranet • 1 ♂ ad. (BL = 12.8 mm), 1 ♀ subad. (BL = 10.1 mm); NW Weddell Sea,ANDEEP-II station 133-3; 65°20.15ʹ S, 54°14.35ʹ W to 65°20.06ʹ S, 54°14.51ʹ W; depth 1122– 1119 m; 7 Mar. 2002; EBS epinet • 3 ♂♂ imm. (BL = 11.2–11.7 mm), 7 juv.; SE Weddell Sea,ANDEEP-III station 074-6; 71°18.35ʹ S, 13°57.71ʹ W to 71°18.28ʹ S, 13°57.31ʹ W; depth 1030–1040 m; 20 Feb. 2005; EBS epinet • 1 damaged juv.; same collection data as for preceding except for occurrence in supranet • 1 ♂ ad. (BL = 14.6 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-13.980166&amp;materialsCitation.latitude=-71.156" title="Search Plazi for locations around (long -13.980166/lat -71.156)">eastern Weddell Slope</a>, Kapp Norvegia, ANDEEP-III station078-10; 71°09.39ʹ S, 13°59.30ʹ W to 71°09.36ʹ S, 13°58.81ʹ W; depth 2156– 2147 m; 21 Feb. 2005; EBS epinet • 1 juv. (BL = 4.7 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-50.634834&amp;materialsCitation.latitude=-63.628834" title="Search Plazi for locations around (long -50.634834/lat -63.628834)">Weddell Slope</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-50.634834&amp;materialsCitation.latitude=-63.628834" title="Search Plazi for locations around (long -50.634834/lat -63.628834)">entrance to Powell Basin</a>, ANDEEP-III station 121-10; 63°37.73ʹ S, 50°38.09ʹ W to 63°37.55ʹ S, 50°38.37ʹ W; depth 2663– 2659 m; 15 Mar. 2005; EBS epinet • 1 ♂ ad. (BL = 16.3 mm), 3 imm. (BL = 9.3–9.7 mm); same collection data as for preceding except for occurrence in supranet • 1 ♂ ad. (BL = 14.3 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.058334&amp;materialsCitation.latitude=-62.774834" title="Search Plazi for locations around (long -53.058334/lat -62.774834)">Powell Basin</a>, ANDEEP-III station 133-2; 62°46.49ʹ S, 53°03.50ʹ W to 62°46.38ʹ S, 53°03.98ʹ W; depth 1584– 1579 m; 16 Mar. 2005; EBS epinet • 1 ♀ ad. (BL = 16.7 mm), 1 ♀ subad. (BL = 13.3 mm), 1 ♂ ad. (BL = 12.6 mm), 1 ♂ subad. (BL = 12.9 mm), 7 juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.469833&amp;materialsCitation.latitude=-61.8095" title="Search Plazi for locations around (long -47.469833/lat -61.8095)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 150-6; 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W; depth 1996– 1993 m; 20 Mar. 2005; EBS epinet • 1 imm. (BL = 8.3 mm), 1 juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-47.134&amp;materialsCitation.latitude=-61.757" title="Search Plazi for locations around (long -47.134/lat -61.757)">Powell Basin</a>, SW continental slope of South Orkney Islands, ANDEEP-III station 151-7; 61°45.52ʹ S, 47°07.68ʹ W to 61°45.42ʹ S, 47°08.04ʹ W; depth 1182–1185 m; 21 Mar. 2005; EBS epinet • 1 damaged juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.0665&amp;materialsCitation.latitude=-59.373333" title="Search Plazi for locations around (long -60.0665/lat -59.373333)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 041-3; 59°22.24ʹ S, 60°04.06ʹ W to 59°22.40ʹ S, 60°03.99ʹ W; depth 2375– 2372 m; 26 Jan. 2002; EBS supranet • 1 ♀ ad. (BL = 10.6 mm), 1 ♀ subad. (BL = 9.3 mm), 5 damaged juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-57.587833&amp;materialsCitation.latitude=-59.673668" title="Search Plazi for locations around (long -57.587833/lat -59.673668)">Drake Passage</a>, NW of Elephant Island,ANDEEP-I station 042-2; 59°40.29ʹ S, 57°35.43ʹ W to 59°40.42ʹ S, 57°35.27ʹ W; depth 3683– 3680 m; 27 Jan. 2002; EBS epinet • 1 ♀ ad. (BL = 14.1 mm), 1 ♀ ad. (damaged, BL = 14.0 mm), 1 ♀ subad. (BL = 9.0 mm), 3 imm. (BL = 4.9, 8.0, 8.9 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-53.958168&amp;materialsCitation.latitude=-60.635334" title="Search Plazi for locations around (long -53.958168/lat -60.635334)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 046-7; 60°38.35ʹ S, 53°57.36ʹ W to 60°38.12ʹ S, 53°57.49ʹ W; depth 2893.6– 2893.2 m; 30 Jan. 2002; EBS epinet • 2 ♀♀ ad. (BL = 12.9, 16.5 mm), 2 damaged imm.; same collection data as for preceding except for occurrence in supranet • 1 ♀ ad. (damaged, BL = 8.8 mm), 1 juv.; same collection data as for preceding • 1 imm. (BL = 6.8 mm), 1 juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-59.983833&amp;materialsCitation.latitude=-59.869167" title="Search Plazi for locations around (long -59.983833/lat -59.869167)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 129-2; 59°52.21ʹ S, 59°58.75ʹ W to 59°52.15ʹ S, 59°59.03ʹ W; depth 3643– 3622 m; 23 Feb. 2002; EBS epinet • 2 imm. (BL = 7.3, 7.8 mm) in separate vial, same collection data as for preceding • 1 imm. (BL = 11.5 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-64.65417&amp;materialsCitation.latitude=-62.522667" title="Search Plazi for locations around (long -64.65417/lat -62.522667)">Bellingshausen Sea</a>, NW of Anvers Island, ANDEEP-III station 154-9; 62°31.47ʹ S, 64°39.45ʹ W to 62°31.36ʹ S, 64°39.25ʹ W; depth 3804–3808 m; 30 Mar. 2005; EBS epinet .</p><p>Type locality and distribution</p><p>The type locality by monotypy is 65°15ʹ S, 80°00ʹ E, 3425 m (Zimmer 1914). So far recorded from the Southern Ocean: East Antarctica, Kerguelen Island, South Georgia, South Shetlands, Clarence Island, Antarctic Peninsula and Weddell Sea, 61– 80° S, 80° E westward to 63° W, 278–3425 m (Zimmer 1914; O.S. Tattersall 1955; Ledoyer 1990; San Vicente 2010); and from the N Atlantic: Iceland Basin, 62– 63° N, 15– 18° W, 1085–2270 m (Meland &amp; Brattegard 2007; Astthorsson &amp; Brattegard 2022). All ANDEEP materials are from the Southern Ocean: South Sandwich Trench, Weddell Sea, Powell Basin, Drake Passage and Bellingshausen Sea, 59° S – 71° S, 14° W – 65° W, 756–3808 m. These records extend the known ranges in the Southern Ocean only marginally northward to 59° S, westward to 65° W, and down to 3808 m.</p><p>Remarks</p><p>Eye rudiments mesially fused except for a short disto-median cleft. Median eye-cyst leads to this cleft. Eye without ocular papilla, no visual elements, no organ of Bellonci. Basal segment of antennular trunk dorsally with antennular bursa. Terminal segment without female lobe. This segment with disto-median lobe armed with four teeth increasing in size laterally and, out of this series, an additional 0–1 short tooth positioned mesially; lobe disto-laterally with four barbed setae. Telson with bare lateral margins.</p></div>	https://treatment.plazi.org/id/EF7B8639FFA5FFC7FD960120FAAE21E3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFA7FFC9FE6B056EFE70278B.text	EF7B8639FFA7FFC9FE6B056EFE70278B.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pseudomma sarsii Willemoes-Suhm	<div><p>Pseudomma sarsii Willemoes-Suhm in G.O. Sars, 1884</p><p>Pseudomma Sarsii Willemoes-Suhm in G.O. Sars, 1884: 37–38 (preliminary description, Kerguelen Islands, Antarctica).</p><p>Pseudomma sarsii – G.O. Sars 1885: 189–191, pl. xxxiv figs 1–3 (detailed description). — Murray 1895: 1296, 1301 (Challenger Expedition records). — Brandt et al. 1998: table i (biogeography, endemism). — Petryashov 2006: 1416 (vertical distribution, in key); 2007: table 2 (biogeography). — Wittmann &amp; Chevaldonné 2021: 155, suppl. (spelling accepted, distribution, in key).</p><p>Pseudomma Sarsii – Stebbing 1893: 269 (Antarctic, in citation). — Patience 1907: 76 (occurrence, in citation). — Hansen 1913: 13 (records, South Georgia). — Rustad 1930: 7–8, fig. 1 (record, South Georgia).</p><p>Pseudomma Sarsi – Gerstaecker &amp; Ortmann 1901: 672, 677 (distribution).</p><p>Pseudomma sarsi – O.S. Tattersall 1955: 93 (taxonomy, distribution, sub-Antarctic). — Siegel &amp; Mühlenhardt-Siegel 1988: 182, fig. 1 (records, Bransfield Strait). — Ledoyer 1995: 607–608, fig. 2b (record, distribution, description). — Meland 2004: 4, fig. 4 (distribution, phylogeny). — San Vicente 2010: 51, fig. 29 (distribution, in key to Antarctic species). — Petryashov 2014a: 150, map 2 (biogeography). — Mees &amp; Meland 2024: Aphia-ID 226910 (spelling accepted).</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 ♀ ad. (BL = 15.7 mm), 6 juv.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.0665&amp;materialsCitation.latitude=-59.373333" title="Search Plazi for locations around (long -60.0665/lat -59.373333)">Drake Passage</a>, NW of Elephant Island, ANDEEP-I station 041-3; 59°22.24ʹ S, 60°04.06ʹ W to 59°22.40ʹ S, 60°03.99ʹ W; depth 2375– 2372 m; 26 Jan. 2002; EBS epinet • 1 ♀ ad. (damaged, BL = 7.3 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-56.0875&amp;materialsCitation.latitude=-60.454" title="Search Plazi for locations around (long -56.0875/lat -60.454)">South Shetland area</a>, NNW of Elephant Island, ANDEEP-I station 043-8; 60°27.12ʹ S, 56°05.10ʹ W to 60°27.24ʹ S, 56°05.25ʹ W; depth 3961.2– 3962.4 m; 4 Feb. 2002; EBS epinet .</p><p>Nomenclatorial note</p><p>The nominative ‘ Sarsius ’ and the genitive ‘ Sarsii ’ are valid Latinizations of the proper name ‘Sars’. As previously stressed by Wittmann &amp; Chevaldonné (2021) the original ending ‘ ii ‘ought to be maintained according to ICZN (1999), Article 33.4.</p><p>Distribution</p><p>Type locality not defined. First description by Sars (1884) based on “several” specimens from the Kerguelen Islands, 48°41ʹ S, 69°03ʹ E, depth 219 m, and on one larger mutilated specimen from Challenger station 153 off East Antarctica, 65°42ʹ S, 79°49ʹ E, depth 3030 m, this last specimen doubted by Hansen (1913) and O.S. Tattersall (1955) to pertain to this species. These and subsequent records were made in the Southern Ocean: Kerguelen Islands, South Georgia, Weddell Sea, Drake Passage, South Orkneys, Bransfield Strait, Shetlands Islands, Falkland Islands (Malvinas) and Beagle Channel, 49– 67° S, 69° E westward to 69° W, depth 75–3962 m (G.O. Sars 1884, 1885; O.S. Tattersall 1955; Siegel &amp; Mühlenhardt-Siegel 1988; Ledoyer 1995; Brandt et al. 1999; San Vicente 2010; Wittmann &amp; Chevaldonné 2021). The record in Murano (1974b) from Japan, Sagami Bay, 35° N, was not accepted by Meland (2004) as belonging to this species. The ANDEEP I samples from deep waters of the Drake Passage, 59– 60° S, 56– 60° W, depth 2372–3962 m, are within previously published acknowledged ranges.</p><p>Descriptive notes</p><p>Features of eye and antennula as described for P. antarcticum . Anterior margin of eye rudiments lined with minute teeth (scales). Antennular trunk with disto-median lobe armed with three small teeth increasing in size laterally, lobe disto-laterally with three barbed setae. Distal lobe of antennal scale extends beyond tooth on outer margin. Antennal scale extends ⅗ of its length beyond antennular trunk and ⅓ beyond 3-segmented antennal peduncle. Uropods setose all around, no spine; endopod extends ⅐ of its length beyond telson. Proximal third of linguiform telson without spines; distal ⅔ of each lateral margin with nine small subequal spines; terminal margin with pair of paramedian setae flanked by three pairs of large spines.</p></div>	https://treatment.plazi.org/id/EF7B8639FFA7FFC9FE6B056EFE70278B	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFA8FFC9FDAE064BFAB42071.text	EF7B8639FFA8FFC9FDAE064BFAB42071.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Marumomysis antarctica San Vicente 2007	<div><p>Marumomysis antarctica San Vicente, 2007</p><p>Marumomysis antarctica San Vicente, 2007: 685–689, figs 1–4.</p><p>Marumomysis antarctica – San Vicente 2010: 47, figs 26, 36d–e (diagnosis, distribution). — Petryashov 2014a: 149–150 (biogeography). — Wittmann 2020: 33 (eye morphology, in comparison). — Mees &amp; Meland 2024: AphiaID 431975 (accepted).</p><p>Material examined</p><p>SOUTHERN OCEAN • 1 ♀ ad. (BL = 23.1 mm), 1 ♂ subad. (at pre-molt stage, BL = 9.7 mm), 1 imm.; <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-60.7425&amp;materialsCitation.latitude=-61.725666" title="Search Plazi for locations around (long -60.7425/lat -61.725666)">Drake Passage</a>, N of South Shetland Islands, ANDEEP-I station 114-4; 61°43.54ʹ S, 60°44.20ʹ W to 61°43.54ʹ S, 60°44.55ʹ W; depth 2914–2920 m; 18 Feb. 2002; EBS supranet .</p><p>Type locality and distribution</p><p>The type locality is in the Southern Ocean: Bellingshausen Sea, 68°59ʹ53ʺ S, 90°26ʹ58ʺ W, depth 1895 m (San Vicente 2007). Additional records in the Bellingshausen Sea at 69– 70° S, 80– 90° W, depth 1320–1895 m (San Vicente 2010). The present record at ANDEEP I station 114-4 is in the Drake Passage at 62° S 61° W, depth 2914–2920 m, indicating significant latitudinal, longitudinal and bathymetric extensions of the known range. The resulting total range is 62– 70° S, 61– 90° W, depth 1320–2920 m.</p><p>Remarks</p><p>Eye rudiments set apart, sickle-shaped with single, tooth-like, non-sensory disto-lateral process, organ of Bellonci present near base, no visual elements, no ocular papilla. Basal segment of antennular trunk dorsally with antennular bursa, ventrally with rounded mid-sagittal carina. Terminal segment without female lobe. Disto-median lobe with four barbed setae and six teeth, five of the latter increasing in size laterally (three such teeth in Dactylamblyops benthophilus sp. nov.: Fig. 4B); as an unusual feature, small sixth tooth on lateral side of largest tooth in M. antarctica . Both rami of pleopod 4 with nine segments in present subadult male. In the original description, San Vicente (2007) reported nine segments in the exopod vs twelve in the endopod of adult males. In the ANDEEP material the left antennular trunk of the adult female and the frons of the subadult male are infested with settled spores of ellobiopsid parasites.</p></div>	https://treatment.plazi.org/id/EF7B8639FFA8FFC9FDAE064BFAB42071	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFA9FFCAFDE8015DFC8F27E8.text	EF7B8639FFA9FFCAFDE8015DFC8F27E8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mysidella G. O. Sars 1872	<div><p>Genus Mysidella G.O. Sars, 1872</p><p>Mysidella G.O. Sars, 1872: 266, 267.</p><p>Mysidella – G.O. Sars 1879: 84–86 (definition). – Zimmer 1909: 169 (diagnosis, key to species). — Illig 1930: 600 (key to species). — Valkanov 1935: 282–283 (in part synonym of Limnomysis). — Banner 1948b: 108 (diagnosis). — Tattersall &amp; Tattersall 1951: 427 (diagnosis). — Ii 1964: 574 (diagnosis). — Kathman et al. 1986: 191 (description, in key). — Fenton 1990: 437 (diagnosis). — Gerken et al. 1997: 140 (diagnosis). — Murano 2002b: 66 (revision, diagnosis). — Chevaldonné et al. 2015: fig. 5 (molecular systematics). — Shimomura 2016: 30–31 (key to species). — San Vicente 2017: table 2 (distribution of NE Atlantic species). — Mees &amp; Meland 2024: Aphia-ID 119883 (accepted).</p><p>Diagnosis</p><p>Based on adults of both sexes. Eyes well developed or less frequently rudimentary, in any case separate. Antennula with small, setose male lobe. Antennal scale lanceolate, setose all around, with small apical segment separated by a transverse suture. Antennal peduncle 3-segmented. Labrum asymmetrical with two unequal posterior lobes. Cutting edge of each mandible reduced to triangular mesial lobe with mostly narrowly rugged margins, no teeth, no spines, no setae. Distal segment of maxillula distally widened, distal margin with series of spines decreasing in size mesially, no setae; endite with few, mostly three, large barbed setae, sometimes also with much smaller setae. Maxilla comparatively small, setose, with well-developed exopod, no spines. Thoracic endopod 1 with enlarged propodus armed with spiniform modified setae on distal margin; dactylus slender with slender nail. Carpopropodus of thoracic endopods 3–8 with two or more segments separated by transverse articulations. Marsupium with two pairs of large oostegites plus a vestigial pair on thoracopods 6. Penes mostly large, tubular. Pleopods reduced to setose plates in both sexes. Uropods unsegmented, setose all around, endopod ventrally with series of spines proceeding parallel and close to mesial margin. Telson with terminal cleft armed with laminae or spines, no seta; terminal lobes outside cleft with spines only; lateral margins with spines at least on distal portions.</p><p>Type species</p><p>Mysidella typica G.O. Sars, 1872 by original designation according to ICZN (1999), Article 68.2.1. The type locality of this species is in the NE Atlantic: Norway, Hardangerfjord, off Utne, 60°26ʹ N, 6°38ʹ E, depth 366 m (G.O. Sars 1872b) according to Article 76.1. of the CODE (ICZN, 1999).</p><p>Species included (18 species acknowledged)</p><p>– M. americana Banner, 1948 from the NE Pacific: California, Canada, 33– 52° N, 118– 159° W, depth 30–600 m (Banner 1948b; Gleye 1981; Price 2001)</p><p>– M. antarctica sp. nov. from the Southern Ocean: Weddell Slope, 71° S, 15° W, depth 3103 m</p><p>– M. australiana Fenton, 1990, from the SW Pacific: Tasmania, Bass Strait, 39– 41° S, 144– 149° E, 32–95 m (Fenton 1990; Price 2001)</p><p>– M. biscayensis Lagardère &amp; Nouvel, 1980 from the NE Atlantic and Mediterranean: Bay of Biscay, Catalan Sea, 39– 44° N, 2° E – 6° W, depth 190–720 m (Lagardère &amp; Nouvel 1980; Price 2001; San Vicente 2017; Ríos et al. 2022)</p><p>– M. hoshinoi Shimomura, 2016 from the NW Pacific: Japan, 35° N, 139° E, depth 35 m (Shimomura 2016)</p><p>– M. incisa Wang, 1998 from the NW Pacific and E Indian Ocean: Qiongzhou Strait, northern South China Sea, Timor Sea, 12° S – 22° N, 110– 130° E, depth 20–115 m (Wang 1998; Liu &amp; Wang 2000; Murano 2002b)</p><p>– M. macrophthalma Murano, 2002 from the NW Pacific: northern South China Sea, 22° N, 118° E, depth 415–437 m (Murano 2002b)</p><p>– M. minuta Brattegard, 1973 from the Caribbean: Colombia, Isla Morro Grande de Santa Marta, 11° N, 74° W, depth 5–40 m (Brattegard 1973, 1974)</p><p>– M. mukaii Murano, 2002 from the Indo-Pacific: W Australia, 32° S, 116° E, depth 3 m (Murano 2002b)</p><p>– M. nana Murano, 1970 from the NW Pacific: Japan, 33– 35° N, 130– 140° E, depth 18–80 m (Murano 2002b)</p><p>– M. orientalis Murano, 2002 from the NW Pacific: eastern East China Sea, Sea of Japan, 31– 43° N, 128– 135° E, depth 347–528 m (Murano 2002b; Golovan et al. 2013)</p><p>– M. rotundincisa Wang, 1998 from the NW Pacific: northern South China Sea, 19– 22° N, 112– 113° E, depth 26–260 m (Wang 1998; Liu &amp; Wang 2000)</p><p>– M. sulcata Murano, 2002 from the E Indian Ocean: Timor Sea, Sulu Sea, 13° S – 8° N, 118– 123° E, depth 535–738 m (Murano 2002b)</p><p>– M. tanakai Ii, 1964 from the NW Pacific: off Japan, 35– 43° N, 138– 145° E, depth 220–1075 m (Murano 2002b; Fukuoka 2009; Shimomura 2016)</p><p>– M. tenuicauda Wang, 1998 from the NW Pacific: northern South China Sea, 20° N, 113° E, depth 78 m (Wang 1998; Liu &amp; Wang 2000)</p><p>– M. truncata Murano, 2002 from the NW Pacific: Japan, 28° N, 129° E, depth 138–141 m (Murano 2002b)</p><p>– M. typhlops G.O. Sars, 1872 from the NE Atlantic: Norway, Iceland, 60– 64° N, 5° E – 27° W, depth 293–794 m (G.O. Sars 1872b; Astthorsson &amp; Brattegard 2022)</p><p>– M. typica G.O. Sars, 1872 from the NE Atlantic: Iceland, Norway, Ireland, Bay of Biscay, Mediterranean (Balearic Sea, off Monaco, Gulf of Naples), 41– 65° N, 14° E – 15° W, depth 55–540 m (G.O. Sars 1872b; Holt &amp; Beaumont 1900; Holt &amp; Tattersall 1906a; Zimmer 1915; Colosi 1929; Băcesco 1941; Price 2001; Wittmann &amp; Ariani 2019)</p></div>	https://treatment.plazi.org/id/EF7B8639FFA9FFCAFDE8015DFC8F27E8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
EF7B8639FFABFF30FDD40594FC362375.text	EF7B8639FFABFF30FDD40594FC362375.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mysidella antarctica Wittmann 2024	<div><p>Mysidella antarctica sp. nov.</p><p>urn:lsid:zoobank.org:act: 40D908D9-D8C6-479B-BA31-7A6289440CBB</p><p>Figs 62–65</p><p>Diagnosis</p><p>Based on adult females only. All female features as in generic diagnosis. Carapace with broadly rounded anterior margin; rostrum forming a very short, wide-angled, apically rounded prolongation of carapace. Large, broadly rounded (shoulder-like) disto-lateral lobes anteriorly extending to basis of antennal scale. Eyes set apart, cushion-like, only slightly dorsoventrally flattened, with slightly produced rostral margin; presence of a few strongly reduced, completely internal ommatidia not forming a compound organ, no ocular papilla. Second and third segments of antennular trunk separated by, in frontal plane, oblique articulation, resulting in lateral bending of entire trunk. Antennal scale length about 5/2 of maximum width. Scale extending slightly less than half its length beyond antennular trunk. Only basis of thoracic endopod 1 mesially with setose endite (lobe); enlarged propodus with distal margin armed with about seven spiniform modified setae, laterally increasing in size; dactylus slender, about half as long as propodus; dactylus with slender nail about as long as propodus. Endopod of uropods with ≈32 spines ventrally along mesial margin between statocyst and tip; proximal fifth of spine series with small spines discontinuously increasing in size distally, followed by medium-sized subequal spines up to a single subapical spine measuring more than twice that size. Lateral margins of telson straight, slowly converging, proximal ⅖ bare; distally remaining stretch with uninterrupted series of 19–22 spines organized in groups of medium-sized spines with smaller spines in between, average spine size of groups increasing in length distally. Terminal margin with triangular, somewhat ogival incision at 11–12% of telson length. Incision armed with ≈ 12 laminae, no spine, no seta. Each latero-terminal lobe of telson apically with large spine (precise length unknown) flanked by pair of spines with length subequal to that of distal-most lateral spines.</p><p>Etymology</p><p>The species name is a New Latin adjective with feminine ending referring to the distribution of the species in Antarctic marine waters.</p><p>Material examined</p><p>Holotype SOUTHERN OCEAN • 1 ♀ ad. (BL = 7.5 mm); <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.723166&amp;materialsCitation.latitude=-70.65366" title="Search Plazi for locations around (long -14.723166/lat -70.65366)">eastern Weddell Slope</a>, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=-14.723166&amp;materialsCitation.latitude=-70.65366" title="Search Plazi for locations around (long -14.723166/lat -70.65366)">Kapp Norvegia</a>, ANDEEP-III station 080-9; 70°39.07ʹ S, 14°43.36ʹ W to 70°39.22ʹ S, 14°43.39ʹ W; depth 3103– 3102 m; 23 Feb. 2005; EBS supranet; ZMH 64682.</p><p>Paratype SOUTHERN OCEAN • 1 ♀ ad. (BL = 7.9 mm, on slides); same collection data as for holotype except for occurrence in epinet; ZMH 64683 .</p><p>Type locality</p><p>Type locality is ANDEEP III station 080-9: eastern Weddell Slope, Kapp Norvegia, SW of Wegener Canyon, 70°39.07ʹ S, 14°43.36ʹ W to 70°39.22ʹ S, 14°43.39ʹ W, depth 3103– 3102 m. Both type specimens from the same haul, the holotype from the supranet and the paratype from the epinet.</p><p>Description</p><p>Holotype (♀)</p><p>Adult female with BL 7.5 mm, brood pouch empty, not dissected. All features visible without dissection are within limits of specific diagnosis. Rostrum contributes 1%, cephalothorax 31%, pleon (without telson) 54% and telson 16% to total BL.</p><p>CARAPACE. Normal, length 28% of BL (including rostrum), surface smooth (Fig. 62D), no sulci visible. Concave posterior margin leaving ultimate 1½ thoracomeres dorsally exposed.</p><p>EYES (Fig. 62C–D). Antero-posterior extension 0.8 times maximum width (= transverse extension) and 1.3 times length of terminal segment of antennular trunk. Disto-lateral margin of eyes with spiniform scales (as in Fig. 63D). Additional details given below for the dissected paratype.</p><p>ANTENNULA (Fig. 62C–D). Trunk length 9% of BL, extending half its length beyond eyes. Measured along dorsal midline, basal segment 38% trunk length, median 27% and terminal 35%. Length of basal segment 0.8 times width, a setose dorsal apophysis shortly extending beyond its rostral margin. Length of terminal segment 0.7 times width. Width of outer antennular flagellum near basis 1.3 times width of inner flagellum.</p><p>ANTENNA (Fig. 62C). Sympod 2-segmented, caudally in addition with large end sac of antennal gland. Segments 1–3 of peduncle contribute 18%, 40% and 42% to total length in dorsal view.</p><p>CEPHALOTHORAX (Fig. 62). Clypeus with short triangular rostral process reaching to basal third of basal segment of antennular trunk; acute apex of process visible in dorsal view (Fig. 62D). Thoracic endopod 1 with six segments. Endopods 2–8 broken.</p><p>PLEON AND TAIL FAN (Fig. 62A–B). Length of pleomeres 1–5 is 0.8, 0.8, 0.8, 0.7 and 0.7 times length of pleomere 6, respectively. Scutellum paracaudale convex, broadly rounded. Uropods with smooth cuticle, not considering setae and spines. Exopod 1.1 times as long as endopod and 1.2 times as long as telson; endopod 1.1 times as long as telson. Endopod with straight margins weakly converging to blunt terminus. Telson length 1.9 times maximum width and 1.5 times length of ultimate pleomere; width at terminus (measured between lateral margins of latero-terminal spines) 0.4 times maximum width near basis and 0.2 times telson length.</p><p>Paratype (♀)</p><p>Covers features requiring dissection. No pores or scales detected on carapace.</p><p>EYES (Fig. 63A–E). Spiniform scales loosely scattered over dorsal face (Fig. 63E) and more densely in series along disto-lateral margin (Fig. 63D). About twenty completely internal, large, seemingly empty bodies present in lateral third of eye, here interpreted as residuals of ommatidia (Fig. 63C). Organ of Bellonci located mesially from these residuals; a completely internal sphere containing more than fifty small black bodies (Fig. 63B). No pores detected.</p><p>ANTENNULA (Fig. 64A). Basal segment of trunk without antennular bursa, no ventral carina. Terminal segment with disto-median lobe armed with three small teeth increasing in size laterally, lobe disto-laterally with three barbed setae. This segment without callynophore, no female lobe.</p><p>PRIMARY MOUTHPARTS (Fig. 64D–G). Both lobes of labrum with longitudinally narrow, rugged margin (Fig. 64D). Left mandibular palp (Fig. 64E) comparatively small, 3-segmented; basal segment contributes 11%, median segment 56% and apical segment 33% (not including laterally bent tip) to total palp length (right palp complete though artificially distorted). Median segment 3.1 times as long as wide, both margins slightly convex, lateral margin almost straight. Length of apical segment 2.7 times maximum width. Each palp with a few setae, not hispid, its basal segment without setae, median segment with 3–4 smooth setae on distal third of lateral margin and only one smooth seta on mesial margin at ⅔ of length from basis; apical segment with only 1–2 small setae on proximal half of lateral margin; its distal half rostrally with 10–14 setae (rugged due to stiff barbs) along lateral margin; distal half of caudal face with longitudinal series of 6–8 barbed setae along ¼ of segment width from mesial margin, these setae with soft barbs. In addition, mandibular palp bears three setae at laterally bent tip, namely two setae with stiff barbs and a shorter seta without barbs, only largest barbed seta at tip extending beyond any other seta of apical segment (Fig. 64F). Cutting edge of mandibles narrowly rugged along mesial margins (Fig. 64E). Labium bilobate, no seta detected (Fig. 64G).</p><p>GUT (Fig. 63F). Foregut with gross structure as in other Mysidae examined here. As a novelty within this family, foregut contains only smooth setae and smooth spines, no modified spines. No foreguts of any other species of Mysidellinae have been studied so far. Storage volume filled to 80% (partly removed in Fig. 63F) with unidentifiable masticated material and abundant mineral particles plus a few diatoms. Midgut content with essentially same material, though with smaller maximum size of particles. Anal lobe weakly cuticularized (Fig. 65I).</p><p>MAXILLULA (Fig. 64H). Distal segment with distally increasing width, length 2.3 times maximum width; with 14 smooth spines on transverse distal margin, no seta, no pores; spines in continuous series strongly decreasing in size mesially. Endite terminally with three large, barbed setae plus one tiny smooth seta.</p><p>MAXILLA (Fig. 64I). Without pores. Sympod with three mesial lobes which are densely setose along disto-mesial margins. Exopod reaches to terminal margin of basal segment of maxillary palp. Exopod with plumose setae all along lateral margin; largest seta at tip; mesial margin bare. Distal segment of palp contributing ⅔ to total length; palp length 3.2 times maximum width. Distal segment densely setose on transverse terminal margin and on distal ⅔ of mesial margin; lateral margin bare, no spines. Terminal margin of proximal segment ventrally with two large barbed setae, lateral seta partly covered by distal segment in Fig. 64I.</p><p>THORACOPODS (Fig. 65A–D). Basal plate of thoracic exopod 1 with smooth cuticle, length 1.4 times maximum width; plate with bluntly tipped rectangular disto-lateral edge; flagellum 7-segmented (Fig. 65A); exopods 6–8 with length of basal plate 1.7–2.2 times maximum width, flagellum 8-segmented. Epipod 1 leaf-like, 1.2 times as long as merus 1 in frontal view, no seta (Fig. 65A). Endopods 2–8 broken. Outer face of marsupium without setae; inside proximally with setae microserrated by minute stiff cils, ventrally and distally with barbed (plumose) setae (many setae broken in Fig. 65D).</p><p>PLEOPODS AND TAIL FAN (Fig. 65E–J). Pleopods 1–2 (Fig. 65E–F) of about same size, pleopods 2–5 increase in length caudally, no modified setae. Statoliths composed of fluorite, diameter 0.08–0.11 mm (n = 2). Telson with spines and laminae only, no setae, scales or pores.</p></div>	https://treatment.plazi.org/id/EF7B8639FFABFF30FDD40594FC362375	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Wittmann, Karl J.	Wittmann, Karl J. (2024): The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae. European Journal of Taxonomy 940: 1-180, DOI: 10.5852/ejt.2024.940.2577, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2577/11717
