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Crustacea, Decapoda, Dendrobranchiata and Caridea) from Off Northeastern Japan

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Crustacea, Decapoda, Dendrobranchiata and Caridea) from Off Northeastern Japan Bull. Natl. Mus. Nat. Sci., Ser. A, 42(1), pp. 23–48, February 22, 2016 Additional Records of Deep-water Shrimps (Crustacea, Decapoda, Dendrobranchiata and Caridea) from off Northeastern Japan Tomoyuki Komai1 and Hironori Komatsu2 1 Natural History Museum and Institute, Chiba, 955–2 Aoba-cho, Chiba 260–8682, Japan E-mail: [email protected] 2 Department of Zoology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki 305–0005, Japan E-mail: [email protected] (Received 5 October 2015; accepted 22 December 2015) Abstract Four deep-water species of shrimps are newly recorded from off Tohoku District, northeastern Japan: Hepomadus gracialis Spence Bate, 1888 (Dendrobranchiata, Aristeidae), Pasiphaea exilimanus Komai, Lin and Chan, 2012 (Caridea, Pasiphaeidae), Nematocarcinus longirostris Spence Bate, 1888 (Caridea, Nematocarcinidae), and Glyphocrangon caecescens Anonymous, 1891 (Caridea, Glyphocrangonidae). Of them, the bathypelagic P. exilimanus is new to the Japanese fauna. The other three species are abyssobenthic, extending to depths greater than 3000 m, and thus have been rarely collected. The newly collected samples of H. gracialis enable us to reassess diagnostic characters of the species. Nematocarcinus longirostris is rediscovered since the original description, and the taxonomy of the species is reviewed. Glyphocrangon caecescens is the sole representative of the family extending to off northern Japan. Key words : Hepomadus gracialis, Pasiphaea exilimanus, Nematocarcinus longirostris, Glypho- crangon caecescens, redescription, new records National Museum of Nature and Science, Tsu- Introduction kuba (NSMT), Japan. The following four species Thanks to the recent study of extensive collec- are treated, all recorded from the area for the first tions made by research vessels (Komai and time: Hepomadus gracialis Spence Bate, 1881 Komatsu, 2009), the deep-water shrimp fauna (Dendrobranchiata, Aristeidae); Pasiphaea exil- (Dendrobranchiata and Caridea) off the north- imanus Komai, Lin and Chan, 2012 (Caridea, eastern part of Honshu (Tohoku District, ranging Pasiphaeidae); Nematocarcinus longirostris over Aomori, Iwate, Miyagi, Fukushima and Spence Bate, 1888 (Caridea, Nematocarcinidae); Ibaraki Prefectures), Japan, occurring on the con- and Glyphocrangon caecescens Anonymous, tinental shelf to slope down to 1500 m depth, has 1891 (Caridea, Glyphocrangonidae). Of the four, been fairly well documented. In total, 20 species H. gracialis, N. longirostris and G. caecescens of Dendrobranchiata (Aristeidae, Benthesicymi- are abyssobenthic, extending to depths greater dae, Penaeidae, Solenoceridae and Sergestidae) than 3000 m. Hepomadus gracialis was previ- and 47 species of Caridea (Crangonidae, Hippo- ously known only from the holotype collected by lytidae s.l., Nematocarcinidae, Oplophoridae s.l., H.M.S. “Challenger” in 1875 and one recently Pandalidae and Pasiphaeidae) were listed from reported specimen (Hayashi 1992), the present the area together with literature records. material enables us to reassess diagnostic charac- This study deals with newly collected samples ters of the species discussed by Pérez Farfante from off Tohoku District since 2008, and supple- (1973). Nematocarcinus longirostris is rediscov- mented by other specimens deposited in the ered since the original description based on the 24 Tomoyuki Komai and Hironori Komatsu material collected also by H.M.S. “Challenger” in pl. 52; Pérez Farfante, 1973: 449, fig. 5D, E; Hayashi 1983: 282, fig. 55a, b; 1992: 26, figs. 16, 17; Pérez 1875, and the taxonomy of this species is Farfante and Kensley, 1997: 48. reviewed with reexamination of the type material. Not Hepomadus gracialis: A. Milne-Edwards and Bou- The bathypelagic species P. exilimanus, hereto- vier, 1909: 194, figs. 13–19, pl. 1, fig. 3.＝Hepomadus fore known only from waters off Taiwan, is tener Smith, 1884. recorded from Japanese waters for the first time. Material examined. RV “Wakataka-maru”, Material and Methods 1995 cruise, stn D-2000, E of Miyako, Iwate Pre- fecture, 39°22.78′N, 147°07.69′E to 39°30.44′N, Specimens examined in this study have been 143°10.76′E, 1949–2005 m, 7 November 1995, 1 deposited in the institutions indicated by the fol- female (cl 68.5 mm), NSMT-Cr 24272; stn J-2000, lowing abbreviations: CBM: Natural History E of Oharai, Ibaraki Prefecture, 36°25.23′N, Museum and Institute, Chiba, Japan; ICMD: 141°32.52′E to 36°31.04′N, 141°43.61′E, 1845– Instituto de Ciencias del Mar, Barcelona, Spain; 1948 m, 10 November 1995, otter trawl, 5 NHM: Natural History Museum, London, U.K.; females (cl 62.0–70.2 mm, one not measured NSMT: National Museum of Nature and Science, because of damage), NSMT-Cr 20973. Tsukuba, Japan; TM: Tasmanian Museum and RV “Tansei-maru”, KT08-27 cruise, stn S3, Art Gallery, Hobart, Australia. Carapace length off Shimokita Peninsula, Aomori Prefecture, (cl) represents specimen size, measured from the 41°05.00′N, 143°49.88′E to 41°05.40′N, posterior margin of the orbit to the midpoint of 143°51.51′E, 2879–3016 m, 30 October 2008, the posterodorsal margin of the carapace. beam trawl with 3 m opening span, coll. H. Kom- Burukovsky (2000a, 2003, 2012, 2013) has atsu, 1 female (cl 34.1 mm), NSMT-Cr 19820; shown that the ornamentation of the ventral sur- stn S4, similar locality, 41°11.78′N, 143°58.95′E face of the sixth pleomere is diagnostic in differ- to 41°11.88′M. 144°00.36′E, 2889–2995 m, 21 entiating species of Nematocarcinus, naming the October 2008, beam trawl with 3 m opening structure “ventrodistal organ”. Here, we employ span, coll. H. Komatsu, 2 males (cl 31.4, an alternative term “ventral organ” for the struc- 34.5 mm), 2 females (cl 56.8, ca 65.2 mm), ture, because the organ consists of a complex of NSMT-Cr 19821; stn K3, off Kinkazan, Miyagi main row of setal pores and posteriorly located Prefecture, 38°26.49′N, 143°22.53′E to spot (＝posterior spots) on either side of the mid- 38°25.49′N, 143°23.30′E, 2698–2814 m, 23 line of the somite. The structure of the posterior October 2008, beam trawl with 3 m opening spot varies according to species from a low blis- span, coll. H. Komatsu, 2 males (cl 30.5, ter-like protuberance to a rounded field of minute 32.7 mm), NSMT-Cr 19818; stn K4, off Kinka- pits without a trace of elevation. Staining with zan, 38°25.55′N, 143°32.58′E, 38°24.18′N, methylene blue enhances the visibility of these 143°33.03′E, 3137–3223 m, 23 October 2008, structures. beam trawl with 3 m opening span, coll. H. Komatsu, 1 female (cl 70.2 mm), NSMT-Cr 19819. Taxonomic Account RV “Shinkai-maru”, 1991 cruise, Hyuga Basin, Infraorder Dendrobranchiata 1500 m, 3 April 1991, 2 males (cl 58.6, Family Aristeidae 59.5 mm), 6 females (cl 64.0–79.0 mm), NSMT- Cr 23453; same data, 5 females (cl 68.8– Hepomadus gracialis Spence Bate, 1881 75.2 mm), NSMT-Cr 23462. [Japanese name: Beni-chihiro-ebi] Description of females. Body integument (Figs. 1–3) glabrous, without short setae or pubescence. Hepomadus gracialis Spence Bate, 1881: 190; 1888: 321, Rostrum (Figs. 1, 2A) styliform, directed for- Additional Records of Deep-water Shrimps from off Northeastern Japan 25 Fig. 1. Hepomadus gracialis Spence Bate, 1881, entire animals in lateral view. A, female (cl 56.8 mm), RV “Tansei-maru”, KT08-27 cruise, stn S4, off Shimokita Peninsula, Aomori Prefecture, NSMT-Cr 19821; B, young male (cl 34.5 mm), same lot. ward or slightly ascending, straight to slightly unarmed, slightly convex proximally; lateral sur- upturned, gradually tapering to acute tip in lateral face with adrostral carina extending from level of view, 0.5 times as long as carapace, slightly orbital margin to midlength of rostrum, stronger overreaching distal end of antennular peduncle; and distinct basally, and much narrower carina dorsal margin armed with 3 teeth, first tooth along ventral margin, merging into orbital mar- located slightly posterior to orbital margin, and gin, in proximal 0.4. rather remote from second tooth; second and Carapace (Figs. 1, 2A) with sharp postrostral third teeth strongly compressed laterally, sepa- carina extending to about 0.8 length of carapace rated by interval varying from 0.6 of distance and followed by minute tubercle located near between first and second teeth, first tooth located posterior margin; dorsal margin in lateral view proximal to midlength of rostrum; ventral margin strongly arcuate posterior to cervical groove in 26 Tomoyuki Komai and Hironori Komatsu Fig. 2. Hepomadus gracialis Spence Bate, 1881. A, B, young female (cl 34.1 mm), RV “Tansei-maru”, KT08-27 cruise, stn S3, off Shimokita Peninsula, Aomori Prefecture, NSMT-Cr 19820; C, female (cl 70.2 mm), RV “Tansei-maru”, KT08-27 cruise, stn K4, off Kinkazan, Miyagi Prefecture, NSMT-Cr 19819; D–G, male (cl 58.6 mm), RV “Shinkai-maru”, Hyuga Basin, Miyazaki Prefecture, NSMT-Cr 23453. A, anterior part of cara- pace and cephalic appendages, lateral view; B, C, thelycum, median plate on thoracic sternite 7, ventral view; D, left petasma, dorsal view; E, same, ventral view; F, left appendix masculina, dorsal view; G, left appendices interna and masculina, mesial view. Scale bars: 5 mm for A, C, D, E; 2 mm for F, G; 1 mm for B. Additional Records of Deep-water Shrimps from off Northeastern Japan 27 adults (less arcuate in young specimens). Orbital short, shallow median sulcus disappearing ante- or supraorbital tooth absent; antennal tooth rior and posterior portion; ventrolateral margin small, acute, slightly directed dorsally; branchio- bi-lobate proximally, anterior lobe separated stegal tooth vertically compressed, buttressed by from posterior lobe by deep obliquely longitudi- short sharp carina extending to level of hepatic nal groove. tooth; hepatic tooth small.
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