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Crustacea, Decapoda, Brachyura) 国立科博専報，（47）： 219–277，2011年4月15日 Mem. Natl. Mus. Nat. Sci., Tokyo, (47): 219–277, April 15, 2011 Crabs dredged off the Ogasawara Islands (Crustacea, Decapoda, Brachyura) Hironori Komatsu Department of Zoology, National Museum of Nature and Science, 3–23–1 Hyakunincho, Shinjuku-ku, 169–0073 Tokyo, Japan E-mail: [email protected] Abstract. Brachyuran crabs dredged off the Ogasawara Islands, southern Japan, are reported. The collection consists of 73 species of 16 families excluding pilumnoid and xanthoid crabs. Three new species, Cryptodromia maculata sp. nov. (Dromiidae), Ebalia koyo sp. nov. (Leucosi- idae), and Pugettia ogasawaraensis sp. nov. (Epialtidae), are described and illustrated. Fourty- two species are newly added to the carcinological fauna of the Ogasawara Islands including 5 species new to Japanese waters. Biogeography of the recorded species is briefly discussed. Key words: Crustacea, Decapoda, Brachyura, new species, Ogasawara Islands. Matsuura (1894), Yoshihara (1901), Terazaki Introduction (1902–1905), Parisi (1918), Balss (1922), Odhner The Ogasawara (Bonin) Islands is located ca. (1925), Sakai (1938, 1939, 1955, 1976), Miyake 1,000 km south from Tokyo and an oceanic is- (1939, 1970), Takeda and Miyake (1968a, b, lands that have never been connected to continent 1969a, b, 1976), Miyake and Takeda (1969, landmasses (Fig. 1). Its terrestrial fauna and flora 1970), Imajima (1970), Ooishi (1970), Shigei harbour a number of endemic species, but only a (1970), Suzuki (1972), Takeda (1973), Türkay few marine organisms are known to be endemic (1974), Takeda and Kurata (1976a, b, 1977a, b, to the islands, e.g. two species of hermit crabs 1984), Takeda and Tamura (1980, 1981), Asakura (Asakura, 1991; Asakura et al., 1994a, b) and five et al. (1994b), Takeda and Tachikawa (1995), species of marine gastropods (Fukuda, 1993, Castro (2000), Marumura and Kosaka (2003), 1994, 1995). However, faunal study of marine or- Kobayashi (2005), Komai et al. (2006), Komatsu ganisms having planktonic larval stage at the iso- and Takeda (2009), Castro and Ng (2010), and lated islands is important to realize the potential Nguyen and Ng (2010). ability to disperse and speciation. The National Museum of Nature and Science, Many authors have reported on taxonomy of Tokyo, conducted a zoological survey at the sea brachyuran crabs collected from the Ogasawara around the Ogasawara Islands during the years Islands and the knowledge of brachyuran fauna of 2008–2010. The benthic animals were sampled the islands is increasing. However, organized fau- by dredging at the depths of 36–3579 m along the nal survey by using dredge at the sea around the whole Ogasawara Islands and Kaikata Seamount, Ogasawara Islands is restricted to Takeda (1977). which is located 115 km west of Haha-jima Is- He recorded 28 species from 12 stations at the land. Among a total of 136 stations, 60 stations west side of Chichi-jima Island. Of these 5 spe- were positive for brachyuran crabs at the depths cies were new to science and 9 were new to Japa- of 36–499 m. The collections of brachyuran crabs nese waters. Other published works on are referred to 73 species of 16 families except brachyuran taxonomy on the basis of material pilumnoid and xanthoid crabs, which are under from the Ogasawara Islands include Stimpson studying by Prof. Takeda of the Teikyo Heisei (1858, 1907), Rathbun (1894), Hirota (1894), University. Of these three new species are de- 220 Hironori Komatsu Fig. 1. Maps showing the survey area, the Ogasawara Islands (upleft reproduced from Nakano et al. (2009)). Crabs dredged off the Ogasawara Islands 221 Table 1. Sampling data of R/V Koyo 2008, 2009 and 2010 cruise. Abbreviations for sampling gears: BD: biological dredge of 50 cm span opening; RD: rocky dredge of 50 cm span opening; 1m RD: rocky dredge of 1 m span open- ing. The stations with asterisk are located outside the map. Station Locality Position in Position out Depth (m) Date Gear KY-08-03 West of Nishi-jima I. 27°07.45′N 142°06.38′E 27°07.86′N 142°06.90′E 154–152 24 Oct. 2008 BD KY-08-06 West of Chichi-jima I. 27°04.64′N 142°08.52′E 27°04.69′N 142°08.68′E 88–88 24 Oct. 2008 RD KY-08-11 West of Chichi-jima I. 27°03.62′N 142°08.89′E 27°03.66′N 142°08.88′E 56–62 27 Oct. 2008 RD KY-08-12 South of Chichi-jima I. 27°00.19′N 142°11.61′E 27°00.21′N 142°11.74′E 136–135 28 Oct. 2008 RD KY-08-13＊ South of Chichi-jima I. 26°58.07′N 142°09.07′E 26°57.81′N 142°09.06′E 150–152 28 Oct. 2008 BD KY-08-15 West of Chichi-jima I. 27°04.55′N 142°09.16′E 27°04.73′N 142°09.31′E 83–81 28 Oct. 2008 RD KY-08-17 East of Chichi-jima I. 27°05.02′N 142°15.22′E 27°04.86′N 142°15.22′E 70–69 29 Oct. 2008 BD KY-08-18 East of Chichi-jima I. 27°05.01′N 142°14.89′E 27°04.88′N 142°14.87′E 49–48 29 Oct. 2008 BD KY-08-19＊ East of Chichi-jima I. 27°06.07′N 142°18.56′E 27°06.06′N 142°18.76′E 175–176 29 Oct. 2008 BD KY-08-20 East of Chichi-jima I. 27°04.23′N 142°15.19′E 27°04.22′N 142°15.06′E 54–52 29 Oct. 2008 BD KY-08-21 East of Chichi-jima I. 27°03.84′N 142°15.44′E 27°03.70′N 142°15.23′E 95–98 29 Oct. 2008 BD KY-08-22 West of Ototo-jima I. 27°10.65′N 142°07.27′E 27°10.71′N 142°07.37′E 150–151 30 Oct. 2008 BD KY-08-25 West of Nishi-jima I. 27°07.31′N 142°07.70′E 27°07.03′N 142°07.64′E 129–127 30 Oct. 2008 BD KY-08-26 West of Chichi-jima I. 27°04.84′N 142°08.93′E 27°04.98′N 142°09.15′E 84–87 30 Oct. 2008 BD KY-09-07 West of Minami-jima I. 27°01.72′N 142°07.39′E 27°01.93′N 142°07.28′E 138.2–136 10 Jul. 2009 BD KY-09-08 North of Haha-jima I. 26°45.20′N 142°06.44′E 26°45.38′N 142°06.55′E 98.3–102.4 13 Jul. 2009 BD KY-09-13 South of Haha-jima I. 26°34.10′N 142°10.79′E 96.5 14 Jul. 2009 BD KY-09-14 South of Haha-jima I. 26°34.03′N 142°10.80′E 26°34.04′N 142°10.81′E 92–93.1 14 Jul. 2009 BD KY-09-21 Northwest of Ototo-jima I. 27°13.09′N 142°09.19′E 27°13.19′N 142°09.23′E 135.8–135.5 15 Jul. 2009 BD KY-09-27 East of Ani-jima Channel 27°06.29′N 142°13.88′E 27°06.28′N 142°14.01′E 81–83.4 15 Jul. 2009 BD KY-09-28 East of Nishi-jima I. 27°07.05′N 142°10.68′E 27°07.02′N 142°10.69′E 52.1–52 15 Jul. 2009 BD KY-09-29 South of Nishi-jima I. 27°06.59′N 142°10.25′E 27°06.58′N 142°10.21′E 60.7–60.3 16 Jul. 2009 BD KY-09-30 East of Nishi-jima I. 27°07.22′N 142°10.60′E 27°07.28′N 142°10.58′E 51.6–49.9 16 Jul. 2009 BD KY-09-31 Southeast of Chichi-jima I. 27°00.84′N 142°16.81′E 27°00.92′N 142°16.56′E 311.4–299.7 16 Jul. 2009 BD KY-09-33 West of Minami-jima I. 27°02.19′N 142°07.26′E 27°02.27′N 142°07.27′E 136.5–136.6 16 Jul. 2009 BD KY-09-34 West of Minami-jima I. 27°02.34′N 142°07.52′E 27°02.55′N 142°07.34′E 138.9–140.9 16 Jul. 2009 BD KY-10-02 East of Haha-jima I. 26°41.44′N 142°10.33′E 26°41.33′N 142°10.39′E 115.3–114.8 5 Jul. 2010 BD KY-10-06 North of Haha-jima I. 26°44.29′N 142°06.23′E 26°44.29′N 142°06.37′E 76–72.9 5 Jul. 2010 BD KY-10-07 South of Ane-jima I. 26°31.60′N 142°08.85′E 26°31.60′N 142°08.94′E 104.7–99 6 Jul. 2010 BD KY-10-11 Anejima-dashi Bank 26°38.98′N 142°11.85′E 26°38.95′N 142°11.96′E 93.9–82.5 6 Jul. 2010 BD KY-10-19 West of Chihi-jima I. 27°04.82′N 142°08.95′E 27°04.75′N 142°09.06′E 86.9–90.5 7 Jul. 2010 1m RD KY-10-23＊ East of Chichi-jima I. 27°06.22′N 142°18.82′E 27°06.04′N 142°18.69′E 178.4–179.3 8 Jul.
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