Thalamita spinifera Borradaile, 1902

Huang, Yu-Hsuan & Shih, Hsi-Te, 2021, Chthonius rhodochelatus Hadzi 1933, Zoological Studies 60 (60), pp. 1-45 : 23-26

publication ID	https://doi.org/10.6620/ZS.2021.60-60
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scientific name	Thalamita spinifera Borradaile, 1902
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Thalamita spinifera Borradaile, 1902 View in CoL ( Figs. 4B View Fig , 14 View Fig )

Thalamita exetastica var. spinifera Borradaile, 1902: 203 View in CoL (type locality: Maldives).

Thalamita exetastica View in CoL – Sakai 1935: 76, figs. 9, 10a, c ( Japan: Sagami Bay); Sakai 1939: 417, fig. 12 ( Japan: Sagami Bay); Sakai 1965a: 126, pl. 64(3) ( Japan: Sagami Bay); Stephenson 1976: 20 ( Japan). (not Thalamita exetastica Alcock, 1899 View in CoL )

Thalamita spinifera View in CoL – Stephenson and Rees 1967: 93, fig. 34 ( Philippines); Sakai 1976: 371, pl. 133(2) ( Japan: Sagami Bay); Stephenson 1976: 24 ( Japan: Sagami Bay); Moosa 1981: 148 ( Philippines); Cariaso and Garcia 1986: 235, fig. 41 ( Philippines); Dai and Xu 1991: 33, fig. 25 (Nansha Is.); Wee and Ng 1995: 116, fig. 65; Ng et al. 2008: 155 (list); Yang et al. 2008: 790 (list; Nansha Is.); Yang et al. 2012: 328, fig. 128, pl. 14(2) ( China; Nansha Is.); Sasaki 2019: 9271 (list).

Material examined: Taiwan: 1 ovig. female (12.6 × 9.0 mm) (NCHUZOOL 16531), Erzihliao Fishing Port, Kaohsiung, coll. YH Huang, 8 Jul. 2018.

Diagnosis: Carapace subhexagonal, 1.4 times broader than long, surface densely pilose, posterior margin slightly broader than frontal ( Fig. 14A View Fig ). All anterior carapace ridges and cardiac ridges paired, mesobranchial regions with 2 pairs of ridges ( Fig. 14A View Fig ). Front with 6 lobes, median 2 lobes lower than submedian, lateral lobes smallest and tooth-like. Supraorbital margins broad with 2 notches. Anterolateral margins with 5 teeth, tooth 1 with small subsidiary basal tooth ( Fig. 14A View Fig ). Basal antennal segment granulated. Chelipeds with surface granulated; merus with 3 spines on inner margin; carpus with spine on inner margin, 3 smaller spines on outer margin; palm with 5 spines on dorsal surface, outer distal spine small or reduced to a tubercle, outer surface with 3 granulated ridges. Propodus of P5 with spines on inner margin ( Fig. 14B View Fig ).

Coloration in life: Carapace, chelipeds and P2–P5

A 3 mm

gray.

Distribution: Hawaii; French Polynesia; New Caledonia; Australia (western); Indonesia (Banda); Guam; Philippines; Nansha Is.; Taiwan (Erzihliao Fishing Port, Kaohsiung; Fig. 1 View Fig : no. 7); Japan (incl. Ogasawara Is.; Ryukyus); China (incl. Hainan I.); Malaysia (Malay Peninsula); Thailand; India; Maldives; Red Sea; Seychelles; Mayotte I.; Madagascar ( Sasaki 2019; this study).

Ecological notes: Specimens were caught by trawling and collected from fishing port (this study). The habitats are 30–80 meters deep, with muddy, sandy or pebbly bottoms ( Sakai 1976).

Remarks: Thalamita spinifera Borradaile, 1902 is similar to Tha. exetastica Alcock, 1899 , with Tha. spinifera distributed widely in the Indo-West Pacific and Tha. exetastica distributed in the Indian Ocean and the South China Sea ( Sasaki 2019). The female specimen from Taiwan is consistent with Tha. spinifera by the spines on the inner margin of propodus of P5 ( Fig. 14B View Fig ; Yang et al. 2012: fig. 128e, pl. 14(2)) (vs. smooth in Tha. exetastica ; Alcock and McArdle 1900: pl. 47(2); Yang et al. 2012: fig. 104e, pl. 12(4)).

References

Alcock A. 1899. Materials for a carcinological fauna of India. No. 4. The Brachyura Cyclometopa. Part II. A revision of the Cyclometopa with an account of the families Portunidae, Cancridae and Corystidae. J Asiat Soc Bengal 68: 1 - 104.

Alcock A, McArdle AF. 1900. Crustacea. - part VIII. Illustrations of the zoology of the Royal Indian Marine Survey Ship Investigator, under the command of Commander T. H. Heming, R. N., Office of the Superintendent of Government Printing, Calcutta, pls. XLVI - XLVIII.

Borradaile LA. 1902. Marine crustaceans. I. on varieties. II. Portunidae. In: Gardiner JS. (ed) The fauna and geography of the Maldive and Laccadive Archipelagoes, being the account of the work carried on and of the collections made by an expedition during the years 1899 and 1900. University Press, Cambridge, England 1: 191 - 208.

Cariaso BL, Garcia RG. 1986. Swimming crabs. In: Guide to Philippine flora and fauna, Natural Resources Management Center and University of the Philippines, 7: 165 - 253.

Dai AY, Xu ZX. 1991. A preliminary study on the crabs of the Nansha Islands, China. In: Contributions on Marine Biological Research of the Nansha Islands and Neighbouring Waters, China Ocean Press 3: 1 - 47.

Moosa MK. 1981. Crustaces Decapodes: Portunidae. In: Forest J (ed) Resultats des Campagnes Musorstom: I. Philippines (18 - 28 Mars 1976). Mem ORSTOM 91: 141 - 150.

Ng PKL, Guinot D, Davie PJF. 2008. Systema Brachyurorum: Part 1. An annotated checklist of extant brachyuran crabs of the world. Raffles Bull Zool Suppl 17: 1 - 296.

Nobili MG. 1906. Diagnoses preliminaires de Crustaces Decapodes et Isopodes nouveaux recueillis par M. le Dr. G. Seurat aux iles Touamotou. Bull Mus Nat Hist Nat 12: 256 - 270.

Sakai T. 1935. New or rare species of Brachyura, collected by the Misago during the zoological survey around the Izu-Peninsula. Sci Rep Tokyo Bunrika Daigaku (B) 2: 63 - 88.

Sakai T. 1939. Studies on the Crabs of Japan, IV. Brachygnatha, Brachyrhyncha. Yokendo, Tokyo, pp. 365 - 741 + 1 - 23 [= index], pls. 42 - 111.

Sakai T. 1965 a. The crabs of Sagami Bay. Mazuzen Ltd., Tokyo, 206 pp.

Sakai T. 1976. Crabs of Japan and the Adjacent Seas. Kodansha Ltd., Tokyo, 733 pp., 251 pls.

Sasaki J. 2019. The species list of Decapoda, Euphausiacea, and Stomatopoda, all of the world, version 03 - 3.1. Local Independent Administrative Agency Hokkaido Research Organization, Resources Management and Enhancement Division, Abashiri Fisheries Research Institute, Fisheries Research Department, Hokkaido, Japan, 14644 pp. doi: 10.13140 / RG. 2.2.22353.89446.

Stephenson W, Rees M. 1967. Some portunid crabs from the Pacific and Indian Oceans in the collections of the Smithsonian Institution. Proc US Nat Mus 120: 1 - 114.

Stephenson W. 1976. Notes on Indo-West-Pacific portunids (Decapoda, Portunidae) in the Smithsonian Institution. Crustaceana 31: 11 - 26.

Wee DPC, Ng PKL. 1995. Swimming crabs of the genera Charybdis De Haan, 1833, and Thalamita Latreille, 1829 (Crustacea: Decapoda: Brachyura: Portunidae) from Peninsular Malaysia and Singapore. Raffles Bull Zool supplement 1: 1 - 128.

Yang SL, Chen HL, Jiang W. 2008. Brachyura. In: Liu RY. (ed) Checklist of marine biota of China Seas. Science Press, Beijing, pp. 761 - 810. (in Chinese)

Yang SL, Chen HL, Dai AY. 2012. Fauna Sinica. Invertebrata: Crustacea: Decapoda: Portunidae. Science Press, Beijing, China, 8 + 417 pp, 14 pls. (in Chinese)

Figures

Fig. 4. Species of the family Portunidae. A, Thalamita gatavakensis Nobili, 1906, male (16.5 × 9.3 mm) (NTOU), Mao-ao, New Taipei City; B, Thalamita spinifera Borradaile, 1902, female (12.6 × 9.0 mm) (NCHUZOOL 16531), Erzihliao Fishing Port, Kaohsiung; C, Thalamitoides quadridens A. Milne-Edwards, 1869, male (25.4 × 13.3 mm) (NTOU), Sansiantai, Taitung; D, Thalamitoides tridens A. Milne-Edwards, 1869, female (16.1 × 8.2 mm) (NCHUZOOL 16520), Dongsha I.; E, Thranita cerasma (Wee & Ng, 1995), female (66.4 × 42.6 mm) (NCHUZOOL 16537), Dongsha I.; F, Thranita coeruleipes (Hombron & Jacquinot, 1846), male (59.7 × 40.5 mm) (NCHUZOOL 16507), Wanlitong, Kenting, Pingtung.