taxonID	type	description	language	source
03DE87A3E2092C7CFF7DFA152AC5438E.taxon	materials_examined	Material examined. Sea of Okhotsk: off Kitami Monbetsu, Hokkaido, 44 ° 48 ’ N, 143 ° 21 ’ E to 44 ° 44 ’ N, 143 ° 26 ’ E, 142 – 138 m, 17 November 1991, RV “ Hakuyo-maru ”, trawl, 2 females (cl 32.0, ca. 32.0 mm), 1 ovigerous female (cl 35.2 mm), NSMT-Cr 1585; off Kitami Monbetsu, 44 ° 53.48 ’ N, 143 ° 22.28 ’ E, 144 – 148 m, 16 November 1991, RV “ Hakuyo-maru ”, trawl, 1 male (cl 27.0 mm), NSMT-Cr 1598; off Kitami Monbetsu, 44 ° 48.7 ’ N, 143 ° 36.5 ’ E to 44 ° 44.8 ’ N, 143 ° 42.4 ’ E, 153 – 156 m, 16 November 1991, RV “ Hakuyo-maru ”, trawl, 1 ovigerous female (cl 29.3 mm), NSMT-Cr 1609. Pacific side of Hokkaido: off Kushiro, March 1961, 1 ovigerous female (cl 28.0 mm), NSMT-Cr 1692. Sanriku: off Miyako, Iwate Prefecture, depth not recorded, December 1982, commercial trawler, coll. T. Komai, 1 female (cl 17.4 mm), HUMZ-C 00023; same locality, January 1987, commercial trawler, 1 male (cl 15.0 mm), HUMZ-C; Sea of Japan: Peter the Great Bay, off Vladivostok, depth not recorded, trawl, coll. Y. M. Yakovlev, 1 male (cl 14.4 mm), 2 females (cl 24.0, 32.3 mm), CBM-ZC 3821; Musashi Bank, 44 ° 40.48 ’ N, 140 ° 02.38 ’ E to 44 ° 39.53 ’ N, 140 ° 02.83 ’ E, 198 – 206 m, 28 May 2011, RV “ Tansei-maru ”, KT 11 - 9 cruise, stn M 2, beam trawl with 3 m span opening, 1 female (cl 7.8 mm), NSMT-Cr 22577; off Otaru, Hokkaido, ca. 150 – 200 m, 21 June 2003, commercial trap, coll. Y. Matsuzawa, 1 ovigerous female (cl 28.4 mm), CBM-ZC 7356; off Hokkaido, 200 – 250 m, April 2004, commercial trap, coll. Y. Matsuzawa, 1 female (cl 36.7 mm), CBM-ZC 7914; North Yamato Bank, 43 ° 23.0 ’ N, 135 ° 05.0 ’ E, 150 – 200 m, 30 May 1996, trawl, coll. Y. M. Yakovlev, 2 females (cl 18.6, 19.2 mm), CBM-ZC 4990; off Togi, Noto Peninsula, Ishikawa Prefecture, 20 May 2007, commercial trap, 2 males (cl 22.6, 24.5 mm), IMNH; Wakasa Bay, Fukui Prefecture, 36 ° 06.03 ’ N, 135 ° 35.44 ’ E to 36 ° 06.63 ’ N, 135 ° 37.13 ’ E, 336 – 338 m, 31 May 2009, RV “ Tanshu-maru ”, stn T 111, otter trawl, 2 females (cl 26.0, 28.7 mm), NSMT-Cr 22576; off Hamada, Shimane Prefecture, 35 ° 53.59 ’ N, 131 ° 28.46 ’ E, 35 ° 53.50 ’ N, 131 ° 26.62 ’ E, 342 – 329 m, 9 May 2009, RV “ Tanshu-maru ”, otter trawl, 1 female (damaged, not measured), NSMT-Cr 22574; SE of Oki Islands, 35 ° 54,83 ’ N, 133 ° 50.71 ’ E to 35 ° 53.33 ’ N, 133 ° 50.64 ’ E, 206 m, 2 June 2009, RV “ Tanshu-maru ”, otter trawl, 1 male (cl 30.5 mm), 1 female (cl 34.0 mm), NSMT-Cr 22575; NW of Hinomisaki, Izumo, Shimane Prefecture, ca. 150 m, 1994, trawl, 2 males (cl 21.5, 22.8 m), 1 female (cl 21.8 mm), CBM-ZC 12596.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2092C7CFF7DFA152AC5438E.taxon	description	Redescription. Adult females. Body (Figs. 1, 2 A, B) robust; integument firm, surface with dense short pubescence on entire carapace and depressions on pleonal pleura; tips of spines or teeth frequently darkly pigmented generally. Rostrum (Figs. 2 A) directed forward or slightly ascending, nearly straight or slightly curving dorsally, far overreaching distal end of antennular peduncle but not reaching distal margin of antennal scale, 0.6 – 1.0 times as long as carapace, with dagger-like distal part; dorsal margin armed with 2 or 3 widely spaced small teeth in proximal 0.6 – 0.7, followed by 4 prominent, crested postrostral teeth; ventral margin armed with 2 – 4 small teeth in distal 0.4, ventral lamina moderately developed, outline of ventral margin gently convex; lateral carina conspicuous in proximal 0.6. Carapace (Figs. 1 A, B, 2 A, 3 A) with high middorsal carina extending to posterior margin of carapace; postrostral teeth noticeably increasing in size anteriorly, anteriormost tooth strongest, distally overhanging rostral base, posteriormost tooth arising at 0.7 length of carapace; supraorbital tooth very strong, arising at rostral base, slightly curving dorsally in lateral view and slightly laterally in dorsal view, its dorsal margin carinate and fairly elevated (thus, surface between rostrum and supraorbital tooth forming deep channel), ventral margin slightly sinuous or convex in lateral view, merging into postrostral ridge; deep excavation just ventral to base of supraorbital tooth merging into orbit; suborbital lobe prominent, roundly subtriangular, inner margin keeled; anterolateral margin between antennal and pterygostomial teeth deeply notched at base of antennal tooth and then convex; antennal tooth very strong, far overreaching suborbital lobe, distinctly buttressed; pterygostomial tooth also strong, directed forward; postorbital region deeply depressed; branchial ridge clearly delimited, continuing to ridge supporting antennal tooth. Pleon (Figs. 1 A, 2 B) dorsally rounded; first to fifth pleura each with shallow but distinct depressions to receive overlapping pleura. First pleomere with anterolateral margin slightly sinuous; pleuron usually with 2 (rarely 3) strong, subequal ventral teeth (ventral margin between teeth deeply concave). Second pleomere with deep transverse groove on tergum, posterior section slightly higher than anterior section; pleuron usually with 3 teeth (rarely 4 or 5), middle tooth strong, others small, sometimes abraded in large specimens. Third pleomere with posterodorsal margin fairly produced posteriorly; pleuron usually with 3 (rarely 4) ventral teeth, second tooth strongest. Fourth pleuron usually with 2 – 4 (most frequently 3) ventral teeth, second tooth elongate. Fifth pleuron usually with 2 (rarely 3) strongly unequal ventral teeth, posteroventral one elongate. Sixth pleomere 2.2 times as long as fifth pleomere and 1.3 times as long as high; posterodorsal margin slightly produced and bilobed (Fig. 3 C); posterolateral process terminating in slender tooth (Fig. 3 D); posteroventral angle strongly flared laterally, with strong tooth (Fig. 3 C). Telson (Fig. 3 C) about 1.9 times as long as sixth pleomere, 3.2 times longer than greatest width, gradually tapering posteriorly; dorsal surface deeply sulcate medially, proximally with prominent protuberance bearing tuft of short setae posteriorly (Fig. 3 D); dorsolateral ridge distinct, with row of 6 or 7 spines on either side; posterior margin terminating in blunt to acute point, with 2 pairs of small spines (mesial pair stronger than lateral pair) and tufts of setae at base of median tooth (Fig. 3 E). Eye (Figs. 2 A, 3 A) subpyriform with eyestalk narrowing proximally; cornea small, slightly wider than eyestalk, its maximum width 0.15 of carapace length; ocellus present. Antennular peduncle (Figs. 2 A, 3 A) reaching midlength of antennal scale. First segment longer than distal two segments combined, dorsodistal margin armed with 1 very strong, obliquely erect tooth; stylocerite elongate, faintly sinuous, reaching distal end of antennular peduncle, bearing small, low protuberance proximolaterally. Second segment about 0.6 length of first segment, armed with l strong dorsolateral distal tooth. Third segment short, armed with 1 strong dorsodistal tooth. Upper flagellum with thickened aesthetasc-bearing portion about 0.3 of carapace length; lower flagellum longer than upper flagellum, articles each with few short setae on distal margin. Antenna (Figs. 2 A, 3 A, F) with basicerite bearing strong ventrolateral distal tooth directed slightly laterally; dorsolateral distal angle also produced into strong tooth distinctly shorter than ventrolateral distal tooth. Carpocerite falling short of midlength of antennal scale. Antennal scale 0.8 times as long as carapace and about 2.5 times as long as wide; lateral margin nearly straight or faintly sinuous; dorsal surface with blunt median ridge accompanied by narrow, deep groove laterally; distolateral tooth far overreaching rounded distal margin of lamella, supported by longitudinal keel extending to base of antennal scale. Flagellum slightly shorter than body. Mouthparts typical for genus. Third maxilliped (Fig. 4 A) relatively stout, reaching or slightly overreaching distal margin of antennal scale by ultimate segment. Ultimate segment about 2.2 times as long as penultimate segment (= carpus), somewhat depressed dorsoventrally, tapering to rounded distal end only in distal 0.2; dorsal, lateral and ventral surfaces partially obscured by with numerous setae, and also with minute spiniform setae; mesial surface with numerous transverse tracts of stiff setae, also grooming apparatus; distal part circumscribed by small, darkly pigmented spines (Fig. 5 A). Carpus short, with scattered minute spiniform setae and tufts of short transverse rows of stiff setae on dorsal and lateral surfaces; mesial surface with numerous transverse tracts of stiff setae, forming grooming apparatus. Antepenultimate segment strongly depressed in proximal half, distal part subtrigonal in cross section; lateral surface with scattered minute spiniform setae and row of longer spiniform setae on blunt longitudinal ridge; distal margin with conspicuous tooth dorsally and stronger tooth laterally, and with row of spiniform setae on either side of dorsodistal tooth and around base of distolateral tooth (Fig. 5 B). Strap-like, terminally hooked epipods present on third maxilliped to third pereopod, corresponding setobranchs present on first to fourth pereopods. First pereopod (Fig. 4 B) stout, reaching midlength of antennal scale by tip of fingers. Dactylus about 0.7 times as long as palm, terminating in 2 darkly pigmented corneous claws (Fig. 5 E); fixed finger terminating in single corneous claw (Fig. 5 E); both fingers each with 1 darkly pigmented, flattened spines proximal to base of terminal claw (s) on either side (Fig. 5 E). Palm (Fig. 5 C) subcylindrical, about twice as long as wide. Carpus widened distally, cup-like, slightly shorter than palm, lateral surface with scattered minute spiniform setae, distomesial margin with deep notch; grooming apparatus consisting of short, obliquely longitudinal row of setae on ventromesial surface of palm and several short transverse rows of setae on mesial surface of carpus (Fig. 5 D). Merus slightly narrowing proximally, with small tubercle proximodorsally and with several sets of minute spiniform setae on proximal half of ventral margin, dorsodistal margin slightly produced, lateral surface with numerous scattered minute spiniform setae. Ischium with blunt ventrodistal angle, ventrolateral surface with minute spiniform setae. Second pereopod (Fig. 4 C) slender, overreaching antennal scale by about 0.3 length of carpus. Carpus divided into 7 articles, third article longest. Third pereopod (Fig. 4 D) overreaching antennal scale by length of dactylus; dactylus (Fig. 5 F) 0.3 – 0.35 times as long as propodus, stout (about 2.5 times as long as wide), terminating in strong, darkly pigmented unguis, armed with 4 – 6 darkly pigmented accessory spines on flexor margin, these accessory spines noticeably increasing in size distally, distalmost spinule subconical, making tip of dactylus biunguiculate; propodus with numerous darkly pigmented spinules, arranged in irregular 3 or 4 rows, on ventral surface; carpus slightly less than half length of propodus, slightly widened distally, armed usually with 1 or 2 small spines on lateral surface; merus armed with lateroventral row of 8 – 15 spines extending over entire length, and 1 – 7 smaller additional spines not aligned with lateroventral row; ischium also with 1 small lateral spine. Fourth pereopod (Fig. 4 E) falling far short of distal margin of antennal scale by tip of dactylus; merus with lateroventral row of 7 – 10 spines and 0 – 6 smaller additional non-aligned spines particularly on ventral surface; ischium unarmed or armed with 1 lateral spine. Fifth pereopod (Fig. 4 F) generally similar to preceding pereopods, but merus shorter and carpus and propodus combined longer; not reaching midlength of antennal scale; propodus with brush-like grooming setae distally; carpus with 1 or 2 small spines on lateral surface; merus armed with lateroventral row of 6 – 9 spines and 0 – 3 additional smaller spines not aligned; ischium unarmed. Protopods of pleopods in spawning molts each with deep ventrolateral lobe distally terminating in subacute or blunt point. Uropod (Fig. 3 G) with protopod bearing sharp posterodorsal tooth, posterolateral angle terminating in strong tooth. Exopod with small spine just mesial to strong posterolateral tooth; dorsal surface with distinct longitudinal carina lateral to midline. Endopod with distinct median carina and scattered minute setae on dorsal surface. Eggs 2.4 x 2.0 mm in eyed stage, not counted. Adult males. Generally similar to females except for sexual characters and smaller body size. Outer antennular flagellum (Fig. 6 A) with thickened aesthetasc-bearing portion about 0.5 times as long as carapace; inner flagellum elongate (Fig. 6 A) and stout, slightly tapering distally, 1.3 – 1.9 times as long as carapace; most articles wider than long. Endopod of first pleopod (Fig. 6 B) rather abruptly tapering distally to terminal appendix interna in distal 0.3; mesial margin fringed with short simple setae; lateral margin sinuous, with row of moderately long plumose setae extending from base to distal 0.3. Appendix masculina of second pleopod (Fig. 6 C) 0.7 length of appendix interna, rounded terminally, bearing numerous stiff setae on distal end to distal 0.6 of mesial surface. Juvenile. Generally similar to adults, but additional small spines on meri of third to fifth pereopods not differentiated; minute spiniform setae on third maxilliped and pereopods also not differentiated. Coloration in life. Carapace mottled with white and reddish brown. Pleon with brown or reddish brown transverse bands on whitish background (second to fifth pleomeres each with band). Telson whitish in anterior half, reddish brown in posterior half. Size. Largest male cl 30.5 mm, largest female cl 36.7 mm, ovigerous females cl 28.0 – 35.2 mm.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2092C7CFF7DFA152AC5438E.taxon	distribution	Distribution. Certain geographical range includes Kamchatka, Sea of Okhotsk, Sea of Japan, Pacific side of northern Japan extending from Hokkaido to Iwate Prefecture; 144 – 338 m.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2092C7CFF7DFA152AC5438E.taxon	description	Variation. The number of ventral teeth on the second to fifth pleura of the pleon exhibits substantial variation not related to sex or size (Table 1), although in some cases, the absence of tooth or teeth seems to be due to secondary loss caused by damage or abrasion. The second pleura usually bear three ventral teeth, although the number of the teeth on either side varies from three to five. The third pleura have three teeth at least on one side in all specimens examined. The fourth pleura have three or more teeth in vast majority of the specimens (83.3 %). The fifth pleura bear two ventral teeth at least on one side in most specimens (95.8 %). Second pleura Combination of number of teeth 2 - 3 3 - 3 3 - 4 4 - 5 Number of individuals 2 (8.3 %) 19 (79 %) 2 (8.3 %) 1 (4.4 %) Third pleura Combination of number of teeth 2 - 3 3 - 3 3 - 4 Number of individuals 1 (4.5 %) 19 (86.4 %) 2 (9.1 %) Fourth pleura Combination of number of teeth 2 - 2 2 - 3 3 - 3 3 - 4 Number of individuals 4 (16.7 %) 1 (4.2 %) 14 (58.3 %) 5 (20.8 %) Fifth pleura Combination of number of teeth 2 - 2 2 - 3 3 - 3 Number of individuals 20 (83.3 %) 3 (12.5 %) 1 (4.2 %) Size-related variation is seen in the development of scattered minute spiniform setae on the surfaces of meral segments on the third maxilliped through the fifth pereopod and additional spines on the meri of the third to fifth pereopods: in juveniles, such spiniform setae or additional spines are not differentiated, but in large specimens, these setae or spines are prominent. The structure of the inner antennular flagellum exhibits noticeable sexual dimorphism as described and figured above, as in other congeneric species (e. g., Komai et al. 2004, 2012; Komai 2013).	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2092C7CFF7DFA152AC5438E.taxon	discussion	Remarks. Lebbeus armatus shares with L. groenlandicus and L. magnificus n. sp. several diagnostic characters, including the strong postrostral, antennal and pterygostomial teeth on the carapace, the suborbital lobe with a carinate inner margin, the presence of conspicuous ventral tooth / teeth on the first to fifth pleura, the prominent, laterally flared posteroventral teeth on the sixth pleomere, the presence of a prominent proximal protuberance on the dorsal surface of the telson, the possession of a strong tooth at the dorsolateral distal angle of the antennal basicerite, and the presence of a conspicuous tooth on the posterodorsal margin of the uropodal endopod. No other congeneric species have these characteristics, as far as known. Nevertheless, L. armatus is easily distinguished from these two species by many characters, including the possession of a dense covering of short setae on the carapace, extending to postrostral teeth, and on depressions of pleura of the second to sixth pleomeres, the extremely strong, crested postrostral teeth noticeably increasing in the size anteriorly (the first tooth is strongest and produced beyond the second tooth), the clearly delimited branchial ridge on the carapace, the usual possession of at least three pleural ventral teeth on the second to fourth pleomeres, the presence of lateral spines on the carpi of the third and fourth pereopods, and the presence of additional spines, not aligned with lateroventral row, on the meri of the third to fifth pereopods. These characters appear autapomorphic to L. armatus within the genus. In the latter two species, the carapace and pleon bear only sparse setae (in particular, postrostral teeth are glabrous); the postrostral teeth are generally weaker than in L. armatus, of which the first tooth is weaker than the second tooth; the branchial ridge on the carapace is obsolescent; the second to fourth pleomeres are armed with one (second) or at most two (third and fourth; of which the anterior tooth, if present, is minute to tiny) pleural ventral teeth; the carpi of the third and fourth pereopods are unarmed; there are no additional spines on the meri of the third to fifth pereopods. From L. groenlandicus, L. armatus further differs in the more numerous meral spines on the third to fifth pereopods (for details, see Table 2). From L. magnificus n. sp., L. armatus differs in the possession of two pleural ventral teeth on the fifth pleomere (versus usually three) and the less stout inner antennular flagellum in males. The material studied by Owen (1839) is no longer extant (cf. Kim & Komai 2002; Sammy De Grave, personal communication). Nevertheless, Owen’s (1839) original description and figure of Hippolite armata clearly indicate the presence of three teeth on the ventral margins of the second to fourth pleonal pleura. Furthermore, not specifically mentioned in the text, the given figure (pl. 27, fig. 2) clearly shows the postrostral teeth noticeably becoming stronger anteriorly with the first tooth strongest, and the presence of a clearly delimited branchial ridge on the carapace. Consequently, I have little hesitation to resurrect L. armatus as a distinct species and refer the present East Asian material to the species. There are many records of L. groenlandicus from East Asian waters (see synonymy), but references accompanied with figures or photos all matches L. armatus. Therefore, these East Asian records of L. groenlandicus are all referred to L. armatus. On the other hand, further study is needed to establish the specific identity of the records of L. groenlandicus from the Bering Sea to the west coast of North America (Rathbun 1904; Butler 1980). Butler (1980) provided a rather detailed description and figure using specimens from British Columbia, Canada. According to his account, the Canadian specimens agree with L. armatus in the setose surfaces of the carapace and of the pleura of the pleon, and the postrostral teeth noticeably becoming stronger anteriorly, but still differs from L. armatus in the fewer pleural ventral teeth of the third and fourth pleomeres and the fewer meral spines on the third to fifth pereopods (seven to nine in the third, six to eight in the fourth, and six to eight in the fifth). It is highly likely that the northeastern Pacific population represents another, third species closely related to L. groenlandicus. Comments on Hippolite cornuta are noteworthy. Krøyer (1842) and Brandt (1851) concluded that H. cornuta represented a male of Hippolyte aculeata (= L. groenlandicus). In the descriptive text, Owen (1839) stated that “ The abdominal segments terminate inferiorly in two spines, of which the posterior is the strongest; ”, although the given figure seems to show the presence of only one tooth in the second pleuron and of two teeth on the first, third to fifth pleuron. As shown in this study, males of L. groenlandicus can have two ventral teeth in the first, third to fifth pleura and only one tooth in the second pleuron. The sampling locality of the type of H. cornuta was not indicated. The synonymy of H. cornuta with L. groenlandicus is maintained at present. Characters / species L. groenlandicus L. armatus L. magnificus n. sp. Rostral shape dagger-like distal part dagger-like distal part dagger-like distal part relatively small (Fig. 7 A) relatively large (Figs. 2 A, 6 A) relatively small (Figs. 10 A, 13 A)	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2052C63FF7DFAA62B6F409D.taxon	materials_examined	Material examined. Holotype: Kitami-Yamato Bank, southwestern Sea of Okhotsk, Hokkaido, 44 ° 52.6 ’ N, 144 ° 20.7 ’ E, 156 m, 23 July 1992, otter trawl, ovigerous female (cl 24.0 mm) CBM-ZC 12597. Paratypes: same data as holotype, 1 male (cl 17.7 mm), CBM-ZC 12598; same locality as holotype, 44 ° 51.5 ’ N, 144 ° 20.8 ’ E to 44 ° 53.4 ’ N, 144 ° 20.8 ’ E, 156 m, 4 September 1991, otter trawl, coll. T. Komai, 1 male (cl 19.5 mm), 1 female (cl 25.4 mm), CBM-ZC 12599; same locality, 44 ° 30.1 ’ N, 144 ° 14.5 ’ E, 208 m, otter trawl, coll. M. Yabe, 1 female (cl 20.5 mm), CBM-ZC 518.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2052C63FF7DFAA62B6F409D.taxon	description	Description. Females. Body (Fig. 9) robust; integument firm, surface with sparse very short setae on lateral part of carapace and pleonal pleura; tips of spines or teeth darkly pigmented generally. Rostrum (Figs. Figs. 9, 10 A, B) slightly ascending and curving dorsally, reaching distal margin of second segment of antennular peduncle, 0.6 – 0.8 times as long as carapace; dorsal margin armed with 1 small tooth located at or slightly proximal to midlength, followed by 5 much stronger, crested teeth on middorsal carina of carapace (1 tooth sometimes located anterior to rostral base); ventral margin armed with 1 – 3 small teeth in distal 0.4, ventral lamina slightly developed, outline of ventral margin gently convex; lateral carina conspicuous in proximal 0.6, then fading away toward distal. Carapace (Figs. 9, 10 A – C) with high middorsal carina extending to posterior margin of carapace, posteriormost tooth much smaller than preceding 3 teeth, arising from 0.6 of carapace; dorsal outline in lateral view strongly convex; supraorbital tooth very strong, arising at rostral base, directed slightly upward in lateral view and slightly laterally in dorsal view, its dorsal margin carinate and fairly elevated (thus, surface between rostrum and supraorbital tooth forming deep channel), ventral margin slightly sinuous in lateral view; deep V-shaped notch just ventral to base of supraorbital tooth merging into orbit; suborbital lobe prominent, roundly triangular, with rounded sinus just mesial to blunt apex, inner margin crested (Fig. 12 A); anterolateral margin between antennal and pterygostomial teeth strongly sinuous with concavity at base of antennal tooth; antennal tooth strong, reaching as far as suborbital lobe, distinctly buttressed; pterygostomial tooth weaker than antennal tooth, but still well developed, relatively slender; postorbital region deeply depressed; branchial ridge absent. Pleon (Figs. 9, 10 D) dorsally rounded. First pleomere with anterolateral margin obtusely angular; pleuron with 2 small ventral teeth (ventral margin between teeth nearly straight or slightly concave). Second pleomere with deep transverse groove on tergum, posterior section slightly higher than anterior section; pleuron with small tooth at midpoint of ventral margin. Third pleomere with posterodorsal margin gently produced posteriorly; pleuron with small tooth at midpoint of ventral margin. Fourth pleuron with large posteroventral tooth. Fifth pleuron with 2 or 3 ventral teeth, including 1 strong posteroventral tooth and 1 or 2 smaller anteroventral teeth. Sixth pleomere 1.6 times as long as fifth pleomere and 1.7 times as long as high; posterodorsal margin slightly bilobed (Fig. 10 E); posterolateral process terminating in slender tooth (Fig. 12 B); posteroventral angle somewhat flared laterally, with large tooth. Telson (Fig. 10 E) 1.6 times as long as sixth somite, 3.0 times longer than greatest width, tapering posteriorly to convex posterior margin from anterior one-fourth; dorsal surface deeply sulcate medially, proximally with prominent protuberance bearing tuft of short setae posteriorly; dorsolateral ridge distinct, with row of 6 or 7 spines on either side; posterior margin with 2 pairs of spines (mesial pair stronger than lateral pair) and median tuft of setae (Fig. 10 F). Eye (Fig. 10 A, B) subpyriform with eyestalk narrowing proximally; cornea small, slightly wider than eyestalk, its maximum width 0.15 of carapace length; ocellus present. Antennular peduncle (Fig. 10 A, B) reaching midlength of antennal scale. First segment subequal in length to distal two segments combined, dorsodistal margin armed with 1 strong tooth directed forward in dorsal view and obliquely erect in lateral view; stylocerite elongate, faintly sinuous, reaching distal end of antennular peduncle, bearing small, low protuberance proximolaterally. Second segment about 0.6 length of first segment, armed with l strong dorsolateral distal tooth. Third segment short, armed with 1 strong dorsodistal tooth. Upper flagellum with thickened aesthetasc-bearing portion about 0.3 of carapace length; lower flagellum longer than upper flagellum, articles each with few short setae on distal margin. Antenna (Figs. 10 A, B, 12 C) with basicerite bearing strong ventrolateral distal tooth directed slightly laterally; dorsolateral distal angle also produced into strong tooth slightly shorter than ventrolateral distal tooth. Carpocerite falling slightly short of midlength of antennal scale. Antennal scale 0.8 times as long as carapace and 2.2 times longer than wide; lateral margin nearly straight or faintly convex in proximal half; dorsal surface with blunt median ridge; distolateral tooth not reaching broadly rounded distal margin of lamella, supported by longitudinal keel extending to base of antennal scale. Flagellum slightly shorter than body. Mouthparts without distinctive features. Third maxilliped (Fig. 11 A) stout, overreaching distal margin of antennal scale by 0.2 length of ultimate segment. Ultimate segment 2.7 times as long as penultimate segment (= carpus), somewhat depressed dorsoventrally, tapering to rounded distal end only in distal 0.2; dorsal, lateral and ventral surfaces with numerous tufts of short setae; mesial surface with numerous transverse tracts of stiff setae, also forming grooming apparatus; distal part circumscribed by small, darkly pigmented spines (Fig. 12 D). Carpus short, with tufts of short transverse rows of stiff setae on dorsal and lateral surfaces; mesial surface with numerous transverse tracts of stiff setae, forming grooming apparatus. Antepenultimate segment strongly depressed in proximal half, distal part subtrigonal in cross section; lateral surface bluntly ridged longitudinally, with row of spiniform setae over entire length; distal margin with small tooth dorsally and strong tooth laterally, and with row of spiniform setae on either side of dorsodistal tooth and around base of distolateral tooth (Fig. 12 E). Strap-like, terminally hooked epipods present on third maxilliped to third pereopod, corresponding setobranchs present on first to fourth pereopods. First pereopod (Fig. 11 B) stout, reaching distal 0.2 of antennal scale by tip of fingers. Dactylus about 0.6 times as long as palm, terminating in 2 darkly pigmented corneous claws (Fig. 12 H); fixed finger terminating in single corneous claw (Fig. 12 H); both fingers each with 1 darkly pigmented, flattened spines proximal to base of terminal claw (s) on either side (Fig. 12 I). Palm subcylindrical, about twice as long as wide. Carpus widened distally, cuplike, slightly shorter than palm, distomesial margin with deep notch; grooming apparatus consisting of short, obliquely longitudinal row of setae on ventromesial surface of palm and several short transverse rows of setae on mesial surface of carpus (Fig. 12 G). Merus slightly narrowing proximally, with small tubercle proximodorsally and with several sets of minute spiniform setae on proximal half of ventral margin (Fig. 12 J). Ischium with blunt ventrodistal angle. Second pereopod (Fig. 11 C) slender, overreaching antennal scale by about 0.3 length of carpus. Carpus divided into 7 articles, third article longest. Third to fifth pereopods relatively stout, similar in shape but slightly decreasing in length toward posterior. Third pereopod (Fig. 11 D) overreaching antennal scale by 0.3 length of propodus; dactylus (Fig. 12 K) 0.25 – 0.3 times as long as propodus, stout (about 3.5 times as long as wide), terminating in darkly pigmented unguis, armed with 4 – 6 darkly pigmented accessory spines on flexor margin, these accessory spines increasing in size distally, distalmost spinule subconical, making tip of dactylus biunguiculate; propodus with numerous darkly pigmented spinules, arranged in irregular 3 or 4 rows, on flexor surface; carpus slightly less than half length of propodus, slightly widened distally, unarmed; merus armed with lateroventral row of 9 – 11 spines on over entire length, but without additional smaller spines not aligned with lateroventral row; ischium occasionally with tiny spine on lateral surface. Fourth pereopod (Fig. 11 E) reaching distal margin of antennal scale by tip of dactylus; merus with lateroventral row of 7 – 10 spines, but without additional spines. Fifth pereopod (Fig. 11 F) not reaching distal margin of antennal scale; propodus with brush-like grooming setae distally (Fig. 12 L); merus armed with lateroventral row of 6 or 7 spines, but without additional spines; ischium always unarmed. Protopods of pleopods each with deep ventrolateral lamina distally terminating in subacute or blunt point. Uropod (Fig. 10 E) with protopod bearing sharp posterodorsal tooth, posterolateral angle terminating in strong tooth. Exopod with small spine just mesial to tiny posterolateral tooth; dorsal surface with distinct longitudinal carina lateral to midline. Endopod with distinct median carina and scattered setae on dorsal surface laterally. Eggs 3.7 x 2.7 mm, not counted. Males. Generally similar to females except for sexual characters and smaller body size. Rostrum (Fig. 13 A) about 0.8 times as long as carapace, with 1 or 2 dorsal and 3 or 4 ventral teeth. Carapace (Fig. 13 A) with 4 postrostral teeth. Ventral teeth of first to fifth pleura (Fig. 13 B) stronger than in females; fourth pleuron with 1 or 2 ventral teeth in addition to strong posteroventral tooth. Outer antennular flagellum (Fig. 13 A) with thickened aesthetasc-bearing portion about 0.5 length of carapace; inner flagellum (Fig. 13 A) elongate and stout, not tapering distally, 1.3 – 1.9 times as long as carapace; majority of articles wider than long, each article with 1 or 2 minute setae on ventrodistal margin. Endopod of first pleopod (Fig. 13 C) rather abruptly tapering distally to terminal appendix interna in distal 0.3; mesial margin fringed with short simple setae becoming longer and widely spaced distally; lateral margin sinuous, with row of moderately long plumose setae extending to distal 0.3. Second pleopod with appendix masculina (Fig. 13 D) 0.7 length of appendix interna, as stout as appendix interna, rounded terminally, bearing numerous stiff setae on distal end to distal 0.6 of mesial surface. Coloration in life. Unavailable. Size. Largest male cl 17.3 mm, largest female cl 25.4 mm, ovigerous female cl 23.5 mm. Variation. The rostrum bears one dorsal tooth (four specimens) except for the male paratype (CBM-ZC 12599), in which there are two dorsal teeth. The number of the postrostral teeth on the carapace is variable, four in the male specimens or five in the female specimens, although it could not be concluded if this variation is sexrelated. Ventral teeth on pleura of the pleon seem to become smaller with increase of the animal size in females. The number of ventral teeth of the fifth pleomere is variable from two to four (mostly three) on one side, but none of the specimens examined has two ventral teeth on both sides. Like other congeneric species (cf. Komai et al. 2004, 2012; Komai 2013), the new species exhibits strong sexual dimorphism in the structure of the inner antennular flagellum (see above description; cf. Figs. 10 A and 13 A).	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2052C63FF7DFAA62B6F409D.taxon	distribution	Distribution. Known only from Kitami-Yamato Bank, southwestern Sea of Okhotsk, at depth of 156 – 208 m.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2052C63FF7DFAA62B6F409D.taxon	discussion	Remarks. As mentioned above, Lebbeus magnificus n. sp. is morphologically closer to L. groenlandicus than to L. armatus. Nevertheless, the new species is readily distinguished from L. groenlandicus by the following characters (see Table 2): the dorsal margin of the rostrum is armed usually with only one tooth in L. magnificus n. sp., rather than two to four teeth in L. groenlandicus; the postrostral teeth on the carapace in the female is five in L. magnificus n. sp., rather than four in L. groenlandicus; ventral teeth on pleura of the pleon are generally weaker in L. magnificus n. sp. than in L. groenlandicus; the fifth pleuron is armed usually with three or four teeth in L. magnificus n. sp., instead of two teeth in L. groenlandicus; the inner antennular flagellum of males is thicker in L. magnificus n. sp. than in L. groenlandicus; meral spines on the third to fifth pereopods are more numerous in L. magnificus n. sp. than in L. groenlandicus (for detail, see Table 2).	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
03DE87A3E2052C63FF7DFAA62B6F409D.taxon	etymology	Etymology. The specific epithet “ magnificus ” refers to the beautiful appearance of the new species.	en	Komai, Tomoyuki (2015): Reinstatement and redescription of Lebbeus armatus (Owen, 1839), long synonymized with L. groenlandicus (Fabricius, 1775), and description of one new species from the southwestern Sea of Okhotsk, Hokkaido, Japan (Crustacea: Decapoda: Caridea: Thoridae). Zootaxa 3905 (4): 451-473, DOI: 10.11646/zootaxa.3905.4.1
