identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
7D3687905B2BFF9AFF65FC36BCA0E236.text	7D3687905B2BFF9AFF65FC36BCA0E236.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mallacoota chiltoni	<div><p>Mallacoota chiltoni sp. nov.</p><p>(Figs 1–3)</p><p>Moera petriei . — Chilton 1883: 82, pl. 2 fig. 4. [Not M. petriei Thomson, 1882]. Moera subcarinata . — Chilton 1884: 230; 1885b: 369 [Lyttelton specimens]. Elasmopus subcarinatus . — Chilton 1915: 321, figs 5–6 [“form 2”].</p><p>Maera subcarinata . — Hurley 1954: 603 (list, in part).</p><p>Mallacoota subcarinata . — Barnard 1972b: 114, figs 59, 60.</p><p>Mallacoota nananui . — Webber et al. 2010: 220 [not M. nananui Myers, 1985].</p><p>Type material. Holotype: male (15.0 mm), NIWA 69797, Port Waitangi Wharf, Chatham Islands, 43°56.736’S, 176°33.570’E, pile scraping at 0.5 m depth, bottom depth 5 m, site 24, CHT 288, 0 8 Feb 2007. Allotype: female (12.5 mm), NIWA 69788, same collection data as holotype. Other paratypes: 1 male (16.0 mm), 3 females (11.5– 15.0 mm), NIWA 69789, Port Waitangi Wharf, Chatham Islands, 43°56.758’S, 176°33.602’E, pile scraping at 3.0 m depth, bottom depth 5 m, site 25, CHT 310, 0 8 Feb 2007; 1 female (12.0 mm), NIWA 68790, Point Weeding Bay, Chatham Islands, 43°57.677’S, 176°34.937’E, 6 m, site 28, CHT 352, 0 9 Feb 2007.</p><p>Other material examined. Golden Bay: 1 male (15.0 mm), MITS 29464, Separation Point, 40°40.967’S, 173°00.196’E, site 18, GLD372, 0 6 Nov 2007. Kaikoura: 1 female (15.0 mm), MITS 25456, 42°26.448’S, 173°41.962’E, 11.9 m, KBZ216, 18 May 2007. Dunedin: 1 male (10.0 mm), 2 females (8.5–10.0 mm), MITS 34459, 45°48.839’S, 170°37.723’E, 11 m, 2DUD245, 28 Feb 2006; 3 males (8.0–12.0 mm), 2 females (9.0– 10.5 mm), MITS 4975, 45°48.839’S, 170°37.723’E, 10 m, 2DUD253, 28 Feb 2006; 1 male (12.0 mm), 2 females (6.0– 7.0 mm), MITS 4747, 45°48.839’S, 170°37.723’E, 9 m, 2DUD260, 28 Feb 2006; 1 female (11.0 mm), MITS 4973, 45°48.839’S, 170°37.723’E, 9 m, 2DUD261, 28 Feb 2006; 18 males (7.5–14.0 mm), 17 females (8.0– 15.5 mm), MITS 4748, 45°48.839’S, 170°37.723’E, 9 m, 2DUD263, 0 2 Mar 2006. Bluff: 1 female (10.5 mm), MITS 3823, 46°35.796’S, 168°20.561’E, 7 m, 2BLU040, 14 Feb 2006; 1 female (12.0 mm), MITS 3832, 46°35.484’S, 168°20.976’E, 7 m, 2BLU093, 13 Feb 2006; 1 male (12.0 mm), 2 females (9.5–13.0 mm), 46°35.656’S, 168°20.377’E, MITS 3818, 7 m, 2BLU071, 14 Feb 2006; 5 males (8.0– 14.5 mm), 4 females (9.5–15.0 mm), MITS 33452, 46°35.656’S, 168°20.377’E, 3 m, 2BLU067, 14 Feb 2006; 1 male (14.0 mm), 5 females (6.5–11.0 mm), MITS 3829, 46°35.656’S, 168°20.377’E, 7 m, 2BLU063, 14 Feb 2006; 1 male (8.0 mm), 4 females (6.0–13.0 mm), MITS 3817, 46°35.656’S, 168°20.377’E, 7 m, 2BLU062, 14 Feb 2006; 1 male (9.0 mm), 1 female (10.0 mm), MITS 4020, 46°35.709’S, 168°20.002’E, 7.5 m, 2BLU149, 16 Feb 2006; 1 female (12.5 mm), MITS 3803, 46°35.656’S, 168°20.377’E, 3 m, 2BLU072, 14 Feb 2006; 1 male (8.0 mm), MITS 33450, 46°35.619’S, 168°20.340’E, 13.1 m, 2BLU022, 13 Feb 2006. Stewart Island: 3 females (8.0–13.0 mm), MITS 17450, Horseshoe Bay jetty, 46°52.512’S, 168°07.887’E, site 10, quadrat scraping at 0.5 m, STW181, 27 Sep 2006.</p><p>Etymology. Named for Charles Chilton who was the first to report this species from New Zealand, albeit misidentified as Moera petriei Thomson.</p><p>Diagnosis. Coxae 1–3 lacking posteroventral notch. Gnathopod 2 (male) propodus massive, not hirsute, slightly concave anterodistally, straight posteriorly; posterior margin of palm irregularly toothed for full length of occlusal surface; dactylus distally spatulate. Pereopod 5 basis posterior margin straight to slightly rounded; pereopod 6 basis posterior margin slightly concave; pereopod 7 basis posterior margin rounded posteriorly.</p><p>Description of holotype. Body laterally compressed. Head with notch below lateral cephalic lobe, rostrum absent. Eyes oval. Antenna 1 longer than antenna 2; peduncle article 1 broader than and subequal in length to article 2, with 3 robust setae along distal half of ventral margin; article 2 slender, much longer than article 3; primary flagellum&gt;40-articulate, article 1 slightly longer than following articles; accessory flagellum with 5 articles, article 5 minute. Antenna 2 peduncle article 4 longer than article 5; flagellum article 1 slightly longer than following articles.</p><p>Upper lip broader than long, entire. Mandibles with weakly triturative molar; palp small, slender, 3-articulate, article 3 with 2 or 3 medial and 2 apical slender setae; right incisor irregular, lacinia mobilis 8-dentate; left incisor smooth, lacinia mobilis 4-dentate (based on 14.5 mm male, MITS 33452). Lower lip with inner lobes well developed; 2 robust setae on apex of outer lobes. Maxilla 1 with 2-articulate palp; inner plate with 2 terminal spine-like processes, apparently with distal pore. Maxilla 2 inner and outer plates slender, with terminal slender setae. Maxilliped palp 4-articulate; outer plate not reaching distal end of palp article 2, with numerous robust setae along inner and distal margins; inner plate shorter than outer plate with plumose setae along inner margin and simple setae along distal margin.</p><p>Gnathopod 1 subchelate; coxa anterior margin slightly concave, rounded distally, posteroventral corner lacking notch; carpus subequal in length to propodus; palm acute, slightly convex, defined by 2 robust setae posteriorly; dactyl fitting palm.</p><p>Gnathopod 2 massive, subchelate; basis with anterodistal lobe; carpus compressed, propodus enlarged, anterodistal margin slightly concave, posteroventral margin straight; posterior margin of palm irregularly toothed for full length of occlusal surface; dactylus spatulate.</p><p>Pereopods 3–7 dactyli with unguis tapering to acute apex. Pereopod 5 moderately armed with long robust setae; basis longer than broad, slightly rounded posteriorly; merus expanded posteriorly; carpus much shorter than propodus. Pereopod 6 strongly armed with long robust setae; basis longer than broad, slightly concave posteriorly; merus widely expanded posteriorly; carpus much shorter than propodus, widened distally. Pereopod 7 strongly armed with long robust setae; basis longer than broad, rounded posteriorly; merus widely expanded posteriorly; carpus slightly shorter than propodus, widened distally. Gills present on gnathopod 2 to pereopod 6.</p><p>Epimeron 1 anterodistal corner narrowly rounded. Epimeron 2 posterodistal corner produced to a small spine. Epimeron 3 posterodistal corner producing spine.</p><p>Urosomite 1 dorsally bicarinate. Uropods prominently armed with robust setae. Uropod 1 peduncle with a basofacial seta, peduncle slightly longer than rami; rami subequal in length. Uropod 2 peduncle subequal in length to rami; rami subequal in length. Uropod 3 peduncle much shorter than rami; rami subequal in length. Telson about as long as broad; deeply cleft (&gt;66%); apices acutely bifid, with longer outer and shorter inner apical conical extensions and with long robust setae.</p><p>Description of female allotype (sexually dimorphic characters). Gnathopod 2 subchelate, not enlarged; basis lacking anterodistal lobe; merus acutely produced posterodistally; carpus short, shorter than propodus; propodus palm acute, dactylus fitting palm. Oostegites slender from gnathopod 2 to pereopod 5.</p><p>Variation. Gnathopod 2 of juvenile males differing slightly from adult males in having a narrower dactylus, slightly sharpened apically, and a more weakly sculptured palm.</p><p>Habitat. Intertidal to at least 13.1 m, amongst algal fouling, primarily rhodophytes. Algal species from which M. chiltoni was collected are as follows:</p><p>Chlorophyta— Cladophora sp., Ulva sp.</p><p>Ochrophyta— Carpophyllum sp., Dictyota kunthii, Halopteris paniculata, Lessonia tholiformis, Macrocystis pyrifera, Marginariella sp., Undaria pinnatifida, Zonaria sp.</p><p>Rhodophyta— Adamsiella chauvinii, Anotrichium crinitum, Asparagopsis armata, Brongniartella australis, Callophyllis atrosanguinea, Callophyllis variegata, Ceramium apiculatum, Ceramium flaccidum, Ceramium rubrum, Ceramium vestitum, Chondria sp., Delesseria sp., Dipterosiphonia heteroclada, Griffithsia crassiuscula, Griffithsia traversii, Gloiderma saccatum, Haraldiophyllum crispatum, Heterosiphonia concinna, Hymenena variolosa, Laingia hookeri, Medeiothamnion lyallii, Phycodrys quercifolia, Plocamium angustum, Plocamium cartilagineum, Plocamium cirrhosum, Plocamium microcladioides, Pugettia delicatissima, Rhodymenia obtusa, Rhodophyllis acanthocarpa, Schizoseris dichotoma .</p><p>Distribution. New Zealand, from the Chatham Islands (type locality) and localities around the South Island including Bluff, Kaikoura, Golden Bay, Dunedin and Stewart Island.</p><p>Remarks. Mallacoota chiltoni sp. nov. is common and widespread in South Island, New Zealand. Chilton (1883) first recorded it from Lyttelton Harbour as Moera petriei, a different species originally described by Thomson (1882) from Port Pegasus, Stewart Island. The following year Chilton (1884) placed Moera petriei in the synonymy of Megamoera subcarinata Haswell, 1879, and from then the species underwent a series of name changes until placed in Mallacoota (Barnard 1972a) . Barnard (1972b) reported New Zealand material of the species as Mallacoota subcarinata and noted that all belonged to ‘form 2’ as described by Chilton (1915). Lowry &amp; Springthorpe (2005) clarified the identity of M. subcarinata, which is clearly separated from M. chiltoni by the acute rather than rounded apex of the male gnathopod 2 dactylus.</p><p>Mallacoota chiltoni has a southerly distribution in New Zealand. All known localities are south of the Subtropical Convergence, a general marine biogeographic ‘barrier’ recognised for many benthic (albeit usually deepwater) species (Nodder et al. 2003).</p><p>Myers (1985) described Mallacoota nananui from Fiji, and the following year recorded it again from Niue Island (Myers 1986). In those studies, Myers considered M. subcarinata ‘form 2’ reported from New Zealand (Chilton 1915; Barnard 1972b) to be identifiable with M. nananui . However, as Lowry &amp; Hughes (2009) observed, the New Zealand specimens differ from M. nananui in the dentition of the male gnathopod 2 propodus palm and shape of the posterior margin (straight versus concave). These authors also mentioned the lack of a basofacial seta on New Zealand specimens as figured by Barnard (1972b: fig. 60h), but all material examined in this study have such a seta present. In addition, the anterodistal (extensor) margin of the male gnathopod 2 propodus is concave in M. chiltoni, whereas that of adult M. nananui is straight to slightly convex. Care should be taken, however, in separating small M. nananui from M. chiltoni . The degree of concavity of the posterior (flexor) margin of the male gnathopod 2 propodal palm in M. nananui appears to increase allometrically, and in small specimens, the concavity is slight (Fig. 4 A). Nevertheless, the extent of the palmar dentition appears to differ between M. nananui and M. chiltoni at all sizes, distinctly falling short of the dactyl tip (when occluded) in the former and extending the full length of the occlusal surface in the latter; and the ventral margin of the.</p><p>Specimens from Sandal Bay, Lifou (AM P48000: 7 males, 3.6–5.2 mm; 7 females, 2.4–4.5 mm), closely resemble M. chiltoni in the slightly concave distodorsal margin and straight (or nearly straight) posterior margin of the of the gnathopod 2 propodus (Fig. 4 B). The Lifou specimens might represent M. chiltoni, with the differences in mature male body size between Lifou and New Zealand specimens (5.2 mm versus 15.0 mm) reflecting Bergmann’s Rule. The Lifou specimens, however, also differ from M. chiltoni in having only a single ventrodistal robust seta on article 1 of the antennular peduncle (versus a row of 3 robust setae along the distal half of the ventral margin in M. chiltoni) and in the extent of the palmar dentition of gnathopod 2, which, as in M. nananui, falls short of the dactyl tip (when occluded) (versus extending the full length of the occlusal surface in M. chiltoni). The Lifou specimens probably represent an undescribed species. Mallacoota latidactylus Ledoyer, 1982 [type locality: Madagascar], and M. worimi Hughes, 2011 [type locality: Boondelbah Island, New South Wales] also exhibit the blunt, spatula-like male gnathopod 2 dactylus of M. Chiltoni . Mallacoota latidactylus can be distinguished by the posteroventral notches on coxae 1–3, the straight anterior margin of the male gnathopod 2 propodus, and the wellrounded posterior margin of the pereopod 7 basis. Mallacoota worimi is perhaps the most similar species to M. chiltoni but differs in the straight rather than concave anterior margin on the male gnathopod 2 propodus, with a proportionally much longer palm, and a convex posterior margin on the basis of pereopod 6.</p></div>	https://treatment.plazi.org/id/7D3687905B2BFF9AFF65FC36BCA0E236	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.		MagnoliaPress via Plazi	Kilgallen, Niamh M.;Ahyong, Shane T.	Kilgallen, Niamh M., Ahyong, Shane T. (2011): The genus Mallacoota (Crustacea, Amphipoda, Maeridae) in New Zealand. Zootaxa 2929: 22-36, DOI: 10.5281/zenodo.202529
7D3687905B2DFF90FF65FD36BC62E41A.text	7D3687905B2DFF90FF65FD36BC62E41A.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mallacoota petriei (Thomson 1882) Thomson 1882	<div><p>Mallacoota petriei (Thomson, 1882) comb. et stat. nov.</p><p>(Figs 5–8)</p><p>Moera petriei Thomson, 1882: 236, pl. 18, fig. 3.</p><p>Moera subcarinata . — Chilton 1885b: 368 [Stewart Island specimens].</p><p>Elasmopus subcarinatus . — Chilton 1915: 321, figs 1–4 [“form 1”]. — Stebbing 1906: 441 (in part; part M. subcarinata Haswell).</p><p>Maera subcarinata . — Hurley 1954: 603 (list, in part).</p><p>Not Moera petriei . — Chilton 1883: 82 (= Mallacoota chiltoni sp. nov.).</p><p>Type material. Neotype male (9.0 mm), NIWA 69791, Bluff, New Zealand, 46°35.656’S, 168°20.377’E, 3 m, 2BLU064, 14 Feb 2006.</p><p>Other material examined. Te Miko Reef, Bay of Islands: 1 female (6.0 mm), 1 male (10.5 mm), NIWA 69792, 35º13.73’S, 174º11.00’E, 8–11 m RHO1257, coll. B. Crocker &amp; R. D’Archino, 20 Sep 2010; 1 female (10.5 mm), NIWA 69793, 35º13.73’S, 174º11.00’E, 10 m RHO1314, coll. B. Crocker &amp; R. D’Archino, 21 Sep 2010; 1 female (10.0 mm), NIWA 69794, 35º13.73’S, 174º11.00’E, 10 m, RHO1306, coll. B. Crocker &amp; R. D’Archino, 21 Sep 2010; 3 males (9.0– 10.5 mm), 2 females (6.0–7.0 mm), NIWA 69795, Bay of Islands, 35º14.11’S, 174º09.69’E, LIN09305, ROB; 1 male (12.5 mm), NIWA 69796, 35º13.73’S, 174º11.00’E, 8–11.5 m, RHO110, coll R. D’Archino &amp; R. Stewart, 0 8 Feb 2010; 1 male (14.0 mm), NIWA 69797, 35º13.73’S, 174º11.00’E, 8–11.5 m, RHO0503, coll. R. D’Archino &amp; S. Miller, 10 Feb 2010. Bluff: 1 female (9.0 mm), 1 male (6.0 mm), NIWA 69798, 46°35.656’S, 168°20.377’E, 3 m, 2BLU064, 14 Feb 2006; 1 juvenile (6.0 mm), NIWA 69799, 46°35.796’S, 168°20.561’E, 7 m, 2BLU040, 14 Feb 2006; 1 female (7.5 mm), NIWA 69800, 46°35.656’S, 168°20.377’E, 7 m, 2BLU071, 14 Feb 2006; 2 females (7.0–13.0 mm), MITS 3828, 46°35.847’S, 168°20.727’E, 7 m, 2BLU008, 13 Feb 2006; 1 female (8.0 mm), MITS 3791, 46°35.880’S, 168°20.732’E, 3 m, 2BLU107, 15 Feb 2006; 1 female (5.0 mm), MITS 3800, 46°35.484’S, 168°20.976’E, 0 m, 2BLU090, 15 Feb 2006; 2 juveniles (5.5– 6.0 mm), MITS 3811, 46°35.847’S, 168°20.727’E, 3 m, 2BLU010, 13 Feb 2006; 1 female (8.0 mm), MITS 3806, 46°35.484’S, 168°20.976’E, 2 m, 2BLU087, 15 Feb 2006; 1 male (8.0 mm), 3 females (4.5–7.0 mm), MITS 3795, 46°35.76’S, 168°20.405’E, from wharf pile at 3 m over 10 depth, 2BLU061, 14 Feb 2006; 1 juvenile, 6.0 mm, 1 female, 9.0 mm, MITS ex3803, 46°35.656’S, 168°20.377’E, 3 m, 2BLU072, 14 Feb 2006.</p><p>Milford Sound: female (4.0 mm), MITS 27677, 44°35.187’S, 167°47.334’E, pile scrape at 3 m, bottom depth 16 m, MFN448, 10 Jun 2006.</p><p>Diagnosis. Coxae 1–3 with posteroventral notch. Gnathopod 2 (male) propodus massive, moderately hirsute medially, slightly concave anterodistally, straight posteriorly; palm irregular; dactylus falcate. Pereopods 5–6 basis posterior margin slightly concave, pereopod 7 rounded posteriorly.</p><p>Description of neotype. Body laterally compressed. Head with notch below lateral cephalic lobe, rostrum absent. Eyes oval. Antenna 1 longer than antenna 2; peduncle article 1 broader than and subequal in length to article 2, with 3 robust setae along ventral margin (1 distal, 2 proximal); article 2 slender, much longer than article 3; primary flagellum 29-articulate, article 1 twice as long as broad; accessory flagellum with 4 articles, article 4 minute. Antenna 2 peduncle article 4 longer than article 5; flagellum article 1 longer than following articles.</p><p>Upper lip broader than long, entire. Mandibles with weakly triturative molars; palp 3-articulate, article 3 with 2 terminal setae; left incisor 2-toothed, lacinia mobilis 4-toothed; right incisor smooth, lacinia mobilis 8-toothed (based on female NIWA 69798). Lower lip with inner lobes well developed; outer lobes with 1 large and 1 small spine-like process, each apparently with distal pore. Maxilla 1 with 2-articulate palp; inner plate with 2 terminal plumose setae. Maxilla 2 plates slender with apical simple setae; outer plate with sub-apical plumose setae. Maxilliped palp 4-articulate; outer plate not reaching distal end of palp article 2, with numerous robust setae along inner and distal margins; inner plate shorter than outer plate with plumose setae along margins.</p><p>Gnathopod 1 subchelate; coxa anterior margin slightly concave, posteroventral corner with notch; carpus subequal in length to propodus; propodus suboval, with transverse rows of setae on inner surface; palm acute, slightly convex, defined by 2 robust setae posteriorly; dactylus slender.</p><p>Gnathopod 2 massive, subchelate; coxa posteroventral corner with notch; basis with anterodistal lobe; merus sharply produced posterodistally; carpus short, propodus enlarged and oblong, slightly concave along anterodistal margin, hirsute along posterior and medial margins; palm poorly-defined, irregularly sculptured with distomedial shelf, large mid-medial and small proximal blunt teeth; dactylus curved, falcate, irregularly sculptured along occlusal margin.</p><p>Pereopods 3–7 dactyli with unguis tapering to acute apex. Pereopod 5 smaller than pereopods 6–7; coxa slightly more produced posteriorly; basis posterior margin concave. Pereopod 6 basis narrow, posterior margin concave. Pereopod 7 basis rounded posteriorly. Gills present on gnathopod 2 to pereopod 6.</p><p>Epimera 1 and 2 posteroventral corners produced into small spine. Epimeron 3 posteroventral corner acutely produced into large wide spine.</p><p>Urosomite 1 dorsally bicarinate. Uropods strongly armed with robust setae. Uropod 1 peduncle with a basofacial seta; inner ramus slightly longer than outer ramus. Uropod 2 peduncle subequal in length to rami; inner ramus slightly longer than outer ramus. Uropod 3 peduncle much shorter than rami; rami subequal in length. Telson about as long as broad; deeply cleft (&gt;66%); apices acutely bifid, with longer outer and shorter inner apical conical extensions and with 3 long robust setae</p><p>Description of female (sexually dimorphic characters). Based on female, 9.0 mm, NIWA 69798. Gnathopod 2 subchelate, not enlarged; basis lacking anterodistal lobe; merus posterodistally produced; carpus slightly shorter than propodus; propodus palm acute, slightly convex. Oostegites slender, from gnathopod 2 to pereopod 5.</p><p>Variation. Antenna 1 as long as or slightly shorter than body; peduncle article 1 with 4 robust setae along ventral margin; accessory flagellum with 2–5 articles. Male gnathopod 2 palm with mid-medial tooth positioned proximally or distally, dactylus more falcate in larger specimens. Pereopod 7 merus more expanded in larger males.</p><p>Habitat. Intertidal to at least 11.5 m, possibly to 110 m, amongst algal fouling, primarily rhodophytes. Algal species from which M. petriei was collected are as follows:</p><p>Chlorophyta— Ulva sp.</p><p>Ochrophyta— Ecklonia radiata, Halopteris funicularis, Sargassum sinclairii.</p><p>Rhodophyta— Audouinella sp., Bostrychia harveyi, Brongniartella australis, Ceramium apiculatum, Ceramium vestitum, Corallina officinalis, Dasya sp., Delesseria sp., Erythroglossum sp., Griffithsia crassiuscula, Griffithsia sp., Haliptilon sp., Haraldiophyllum crispatum, Medeiothamnion lyallii, Phycodrys quercifolia, Plocamium microcladioides, Polysiphonia brodiei, Rhodymenia leptophylla .</p><p>Distribution. Wide ranging in New Zealand, from the Bay of Islands, Bluff and Milford Sound; possibly also from the vicinity of Three Kings Islands.</p><p>Remarks. Thomson (1882) established Moera petriei based on two syntype specimens taken by dredge at Port Pegasus, Stewart Island; both are now lost. In 1884, Chilton placed this species in the synonymy of Megamoera subcarinata Haswell (now Mallacoota subcarinata), where it remained until Lowry &amp; Springthorpe (2005) redescribed the species based on syntypic material. Because of the morphological complexity of the genus Mallacoota and the confusion in the past over the identities of the New Zealand species, a neotype is designated here to fix the identity of Mallacoota petriei comb. nov. Unfortunately, no suitable specimens were available from the original type locality, Stewart Island. The only available Stewart Island Mallacoota specimens are of Chilton’s ‘form 2’, which correspond to the original concept of M. petriei, particularly in the distally pointed gnathopod 2 dactylus and strongly setose propodus and carpus. Although we could select a neotype from material of ‘form 2’ in order to preserve the original type locality, we favour preserving Thomson’s original concept of M. petriei . Thus, we select a neotype collected from Bluff, the nearest locality to Stewart Island from which we have suitable specimens of ‘form 1’.</p><p>Mallacoota petriei ranges widely in New Zealand spanning both main islands, in contrast to M. chiltoni which apparently does not occur north of the Subtropical Convergence. Thus, Chilton’s (1915: 326) report of Elasmopus subcarinatus from the tip of the North Island between “Three Kings and Cape Maria van Diemen” at 60 fathoms (110 m) is probably based on M. petriei .</p><p>Mallacoota petriei is most similar to species with a falcate male gnathopod 2 dactylus described from southeastern Australia. Mallacoota subcarinata is readily distinguished from M. petriei by the distinctly setose rather than glabrous dorsal pleon, and concave rather than rounded posterior margin of the pereopod 7 basis. Mallacoota euroka Lowry &amp; Springthorpe, 2005, differs from M. petriei in only a few characters: the lack of a distinct distal robust seta on the peduncle article 1 of antenna 1; the more setose male gnathopod 2 propodus, and the different ornamentation of the male gnathopod 2 palm. Mallacoota kameruka Lowry &amp; Springthorpe, 2005, has a rounded rather than slightly concave pereopod 5 and 6 basis and a much deeper sinus between the anterodistal shelf and the mid-palmar tooth. Mallacoota malua Lowry &amp; Springthorpe, 2005, is also very similar, but lacks the notch on the posteroventral corner of coxae 1–3, and has a posterodistal ‘hood-like’ projection on the propodus of pereopods 6– 7. Mallacoota bulowara Hughes, 2011, also lacks the notch on coxae 1–3, and has a rounded posterior margin on the basis of pereopods 5–6. Finally, M. penelope Hughes, 2011, differs in the ornamentation of the male gnathopod 2 palm, lacks the posteroventral notch on coxae 1–3, and has a subquadrate posteroventral corner on the basis of pereopods 5 and 6.</p><p>Stebbing’s (1888) record of M. subcarinata from three Challenger stations, stn 168 off northeastern New Zealand [40°28’S, 177°43’E, 1100 fathoms (2013 m)], stn 161 off Melbourne [33 fathoms (60 m)], and an unnamed station off Port Jackson [30–35 fathoms (55–64 m)], with the corresponding plate 98 labelled as Elasmopus persetosus, was identified by Lowry &amp; Springthorpe (2005) as their new species, Mallacoota kameruka Lowry &amp; Springthorpe (2005) . Mallacoota kameruka is known with certainty only from northeastern, southern and northwestern Australia in shallow inshore waters (shore to 28 m, Lowry &amp; Springthorpe 2005; 55–64 m, Stebbing 1888), so the apparent 2300 m capture depth for the Challenger stn 168 specimen is suspect. The Challenger stn 168 specimen was probably mislabelled and may have originated in Australian waters.</p></div>	https://treatment.plazi.org/id/7D3687905B2DFF90FF65FD36BC62E41A	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.		MagnoliaPress via Plazi	Kilgallen, Niamh M.;Ahyong, Shane T.	Kilgallen, Niamh M., Ahyong, Shane T. (2011): The genus Mallacoota (Crustacea, Amphipoda, Maeridae) in New Zealand. Zootaxa 2929: 22-36, DOI: 10.5281/zenodo.202529
