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Decapoda: Brachyura: Potamidae) from Kerama Group and Kume Island, Central Ryukyu Islands, Japan

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Decapoda: Brachyura: Potamidae) from Kerama Group and Kume Island, Central Ryukyu Islands, Japan Bull. Natl. Mus. Nat. Sci., Ser. A, Suppl. 3, pp. 191–198, March 22, 2009 Geothelphusa amagui, a New Species of the True Freshwater Crab (Decapoda: Brachyura: Potamidae) from Kerama Group and Kume Island, Central Ryukyu Islands, Japan Tohru Naruse1,2 and Shigemitsu Shokita3 1 Raffles Museum of Biodiversity Research, Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Republic of Singapore 2 Present address: Transdisciplinary Research Organization for Subtropical and Island Studies, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903–0213 Japan e-mail: [email protected] 3 Okinawa Study Center, The Open University of Japan, 1 Senbaru, Nishihara, Okinawa, 903–0213 Japan Abstract A new species of the true freshwater crab genus Geothelphusa Stimpson, 1858 is de- scribed from four islands of Kerama Group and Kume Island, Ryukyu Islands, Japan. The new species is morphologically most similar to G. aramotoi Minei, 1973 and in fact, it has been hereto- fore referred to the latter species. However, the structure of the male first gonopod clearly distin- guishes it from the latter. Variations in relative length of the ambulatory legs between insular popu- lations of both species are documented. Key words : Crustacea, Decapoda, Brachyura, Potamidae, Geothelphusa, new species, Kerama Group, Kume Island, Ryukyu Islands, Japan Among the 19 true freshwater crab species sent study is to describe a new species for the known from the Ryukyu Islands (Kasai and population in Kume Island and Kerama Group, Naruse, 2003; Naruse et al., 2004, 2006, 2007), and to document morphological variation. Geothelphusa aramotoi Minei, 1973, is distinc- Specimens examined are deposited in the tive in the short and stout ambulatory legs, and Kumejima Natural and Cultural Center, Kumeji- low, wide and rugose carapace. Although G. ma, Okinawa (KNCC); the National Museum of aramotoi has been recorded from a total of seven Nature and Science, Tokyo (NSMT); Ryukyu islands, viz., Okinawa (type locality), Iheya, University Museum, Fujukan, Okinawa (RUMF); Kume islands, and four islands of the Kerama National Museum of Natural History, Smithson- Group (Tokashiki, Zamami, Aka and Geruma is- ian Institution, Washington, D.C. (USNM); Zoo- lands) (Fig. 1) (Minei, 1973, 1981; Kasai and logical Laboratory, Kyushu University, Fukuoka, Naruse, 2003; Naruse, 2005), no morphological Japan (ZLKU) (ZLKU specimens have been comparison between the insular populations has transferred to the Kitakyushu Museum of Natural been conducted. Our preliminary examination re- History and Human History, Fukuoka, Japan); vealed that the populations from Kume Island and the Zoological Reference Collection of the and the Kerama Group differed from the Oki- Raffles Museum of Biodiversity Research, Na- nawa and Iheya populations in the structure of tional University of Singapore (ZRC). The termi- the male first gonopod. Minor variations in rela- nology and measurements follow Ng (1988), Dai tive length of the ambulatory legs were also (1999), and Shy and Yu (1999). Measurements found within each species. The aim of the pre- provided are of the carapace length and carapace 192 T. Naruse and S. Shokita Fig. 1. Location of the Kerama Group and Kume Island within the Okinawa Islands. Inset: close-up of Kerama Group. width, respectively. 22.9 mm), Oura River, Okinawa Island, coll. For comparative purposes, the following speci- members of Shokita Laboratory, 27 November mens were examined. 2001; RUMF-ZC-859, 1 female (11.5ϫ14.7 Geothelphusa aramotoi Minei, 1973. Holo- mm), 1 juvenile (5.6ϫ7.2 mm), Tima River, Oki- type: ZLKU m. 1106, male (23.7ϫ30.2 mm), nawa Island, coll. members of Shokita Laborato- Taminato, Ohgimi, Okinawa Island, coll. Y. ry, 27 November 2001; RUMF-ZC-860, 2 males Aramoto, 29 January 1972. (17.5ϫ23.2, 21.3ϫ27.2 mm), 3 females (13.3ϫ Paratypes: ZLKU m. 1095, 2 males (16.7ϫ 17.6 to 19.4ϫ25.1 mm), stream on the southeast- 21.6, 18.2ϫ24.1 mm), 2 females (14.4ϫ18.1, ern side of Mt. Gayou, Iheya Island, coll. T. 22.4ϫ28.6 mm), Genga River, Okinawa Island, Naruse, 30 April 2001; KNCC, 1 female coll. Y. Nakasone and H. Minei, 29 June 1972; (23.4ϫ31.2 mm), Mt. Gayou, Iheya Island, coll. ZLKU m. 1096, 26 males (12.7ϫ16.5 to F. Sato, 3 June 2001; ZRC 2008.0019, 1 male 24.8ϫ32.0 mm), 11 females (14.2ϫ18.5–25.7ϫ (17.6ϫ22.6 mm), 1 female (22.2ϫ29.3 mm), 33.1 mm), Taminato, Ohgimi, Okinawa Island, western side of Mt. Gayou, Iheya Island, coll. T. coll. Y. Nakasone and H. Minei, 2 July 1972. Naruse, 30 April 2001. Other specimens: RUMF-ZC-857, 1 male ?Geothelphusa aramotoi or ?Geothelphusa (17.9ϫ22.8 mm), 1 female (20.1ϫ25.7 mm), amagui (see “Remarks”). Two females (22.8ϫ south of Mt. Ishikawa, Okinawa Island, coll. T. 29.5, 22.9ϫ29.4 mm), USNM 20644, Loo Choo Naruse, 27 June 2001; RUMF-ZC-858, 1 male Island, definite locality not indicated, coll. Mr. F. (14.2ϫ18.1 mm), 2 females (14.1ϫ18.9, 17.8ϫ Sakamoto, no date. A new freshwater crab from Kerama Group and Kume Island 193 mm), upstream of Utaha Dam, Aka Island, coll. Taxonomy T. Naruse, 30 March 2000; KNCC, 2 males Geothelphusa amagui sp. nov. (15.3ϫ19.4, 17.6ϫ23.5 mm), Aka Island, coll. F. [New Japanese name: kerama-sawa-gani] Sato, 29 October 1996; ZRC 2008.0017, 2 males (Figs. 2, 3, 4a–c) (15.0ϫ19.7, 16.5ϫ21.4 mm), 3 females (10.8ϫ ϫ Geothelphusa aramotoi – Shokita, 1990: 4, table 2 (part); 14.0 to 20.7 27.4 mm), south of Kubo-dake, anonymous, 1991: 218 (part); anonymous, 1996: 369 Aka Island, coll. T. Naruse, 4 November 2005; (part); Yoshigou, 1999: 21, pl. I–H (part); Segawa, ZRC 2008.0018, 2 males (10.6ϫ13.6, 16.2ϫ20.6 2000: 243, table 1, figs. 1, 2 (part); Kasai and Naruse, mm), Aka Island, coll. Shokita Laboratory, 13 2003: 284, table 7 (part); Naruse, 2005: 224 (part). March 1997; RUMF-ZC-853, 1 female (20.0ϫ Geothelphusa aff. aramotoi – Naruse et al., 2007: 414. 26.6 mm), coll. stream on the northern slope of Material examined. Holotype: RUMF-ZC- Geruma Island, coll. K. Kinjo, 31 March 2000; 843, male (22.1ϫ29.3 mm), substream of RUMF-ZC-854, 1 male (13.9ϫ18.1 mm), 1 fe- Tokashiki River, Tokashiki Island, Kerama male (18.3ϫ24.0 mm), stream on the northern Group, coll. T. Naruse and H.-T. Shih, 16 April slope of Geruma Island, coll. T. Naruse, 2 Octo- 2002. ber 2001; RUMF-ZC-855, 1 male (13.1ϫ17.2 Paratypes: Kerama Group: RUMF-ZC-844, 1 mm), stream on the northern slope of Geruma Is- female (22.6ϫ29.3 mm), same data as holotype; land, coll. K. Kinjo, 5 November 2005; Kume Is- KNCC, 3 males (12.9ϫ16.8 to 17.4ϫ22.4 mm), land: RUMF-ZC-856, 2 males (11.9ϫ15.7, Tokashiki Island, coll. F. Sato, 20 May 2001; 18.6ϫ24.7 mm), 5 females (13.7ϫ18.3 to 21.2ϫ KNCC, 2 males (19.1ϫ24.8, 19.8ϫ25.5 mm), 28.3 mm), 1 juvenile (8.8ϫ11.4 mm), Suhara Tokashiki River, Tokashiki Island, coll. F. Sato, River, coll. T Naruse and H. Kasai, 11 February 23 May 2001; NSMT-Cr 19551, 2 females 2002; KNCC, 2 males (17.8ϫ23.0, 13.1ϫ17.5 (23.4ϫ30.6, 24.0ϫ31.6 mm), headwater of Oh- mm), 3 females (15.1ϫ20.0 to 18.4ϫ25.0 mm), kawa River, Tokashiki Island, coll. members of Kume Island, coll. F. Sato, 21 October 1995; Shokita Laboratory, 12 March 1997; RUMF-ZC- KNCC, 3 males (11.6ϫ15.1 to 16.3ϫ21.0 mm), 845, 4 males (16.6ϫ21.5 to 20.4ϫ25.6 mm), 1 3 females (8.9ϫ11.3 to 13.8ϫ18.0 mm), vicinity female (21.0ϫ27.2 mm), 1 juvenile (5.7ϫ7.7 of Self Defense Force base, coll. F. Sato, 7 No- mm), upstream of Zamami Dam, Zamami Island, vember 1994; KNCC, 6 males (13.4ϫ17.3 to coll. T. Naruse, 3 October 2001; RUMF-ZC-846, 20.6ϫ27.6 mm), 7 females (10.8ϫ14.2 to 2 males (13.3ϫ16.8, 14.2ϫ18.6 mm), 2 females 19.5ϫ26.1 mm), 4 juveniles (4.0ϫ4.9 to 7.5ϫ9.7 (12.6ϫ16.1, 21.5ϫ27.9 mm), Asa, Zamami Is- mm), Shimajiri, coll. F. Sato, 5 November 1994; land, coll. T. Naruse, 3 October 2001; RUMF- NSMT-Cr 19552, 4 males (12.6ϫ16.7 to 18.1ϫ ZC-847, 1 female (24.2ϫ30.8 mm), Ama, Zama- 23.9 mm), 4 females (12.6ϫ16.5 to 21.5ϫ28.6 mi Island, coll. T. Naruse, 3 October 2001; mm), upstream of Shirase River, coll. T. Naruse RUMF-ZC-848, 3 males (11.4ϫ15.2 to 18.8ϫ and H. Kasai, 10 February 2002. 24.9 mm), 3 females (18.5ϫ24.3 to 18.7ϫ24.1 Description. Carapace (Fig. 2) oval, width mm,), Aka Island, coll. T. Naruse, 2 October 1.26–1.36 times length (meanϭ1.31, nϭ59); 2001; RUMF-ZC-849, 2 females (12.9ϫ16.5, dorsal surface uneven, slightly convex longitudi- 14.8ϫ19.0 mm), south of Takehara, Aka Island, nally and transversely. Epigastric crista distinct, coll. H. Tamura, 4 November 2005; RUMF-ZC- postorbital crista indistinct, postfrontal to lateral 850, 3 females (13.6ϫ17.3 to 19.4ϫ25.2 mm), regions rugose; cervical groove indistinct, H- west of Mt. Ufu-dake, Aka Island, coll. T. shaped gastric groove distinct. Frontal margin Naruse, 29 March 2000; RUMF-ZC-851, 1 fe- concave medially, cristate; orbital margins also male (17.6ϫ22.6 mm), Aka Island, coll.
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