Carupa ohashii Takeda, 1993

Huang, Yu-Hsuan & Shih, Hsi-Te, 2021, Chthonius rhodochelatus Hadzi 1933, Zoological Studies 60 (60), pp. 1-45 : 7-11

publication ID	https://doi.org/10.6620/ZS.2021.60-60
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scientific name	Carupa ohashii Takeda, 1993
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Carupa ohashii Takeda, 1993 View in CoL ( Figs. 3A View Fig , 5)

Carupa ohashii Takeda, 1993: 145 View in CoL , figs. 1–3 (type locality: Shimoji

Carupinae View in CoL Lupocyclinae View in CoL Necronectinae

Podophthalminae Portuninae Thalamitinae

I., Japan; Japan: Ryukyus); Ng et al. 2008: 148 (list); Orchard 2012: 276, 1 unnumb. fig. (upper middle) (Christmas I.); Tan et al. 2014: 411 (Christmas I.); Sasaki 2019: 8893 (list).

Carupa cf. ohashii View in CoL – Shih et al. 2020b: 36 (Dongsha I.).

Material examined: Taiwan: 1 female (34.9 × 2 3.1 m m) (N C H U Z O O L 1 6 5 0 0), D o n g s h a I. (20°42'26.3"N 116°43'16.3"E), coll. YH Huang and CY Chi, 2 Nov. 2019.

Comparative material: Carupa tenuipes : 1 female (17.0 × 11.0 mm) (NCHUZOOL 16463), Daguang, Kenting, Pingtung, Taiwan (21°56'01"N 120°44'48"E), coll. JH Lee, 13 Apr. 2012.

Diagnosis: Carapace subhexagonal, surface smooth, 1.5 times broader than long. All carapace ridges absent, except epibranchial regions with a pair of ridges. Front with 2 lobes, each lobe slightly concave in median ( Figs. 3A View Fig , 5A). Supraorbital margins with 2 notches, infraorbital margins with 3 teeth. Anterolateral margins with 7 teeth, tip of first 4 blunt, tip of last 3 sharp, tooth 5 largest ( Figs. 3A View Fig , 5A). Chelipeds with merus having 3 sharp spines on inner margin; carpus with spine each on inner and outer margins; palm smooth without ridge and spine ( Figs. 3A View Fig , 5B). Surface of P5 smooth, inner margin of merus with small spine on distal end ( Fig. 3A View Fig ).

Coloration: Carapace bright orange with symmetrical dark orange stripes ( Fig. 3A View Fig ).

Distribution: Philippines (Mactan I.); Taiwan (Dongsha I.; Fig. 1 View Fig : no. 17); Japan (Ryukyus); Christmas I. ( Sasaki 2019; this study).

10 mm

Fig. 5. Carupa ohashii Takeda, 1993 , female (34.9 × 23.1 mm) (NCHUZOOL 16500). A, carapace; B, palm of right cheliped (outer view).

Ecological notes: A specimen was collected from Dongsha I. ( Fig. 1 View Fig : no. 17) from corals on seagrass bed.

Remarks: The genus Carupa Dana, 1851 currently contains 2 species, Car. ohashii Takeda, 1993 (West Pacific and Christmas I.) and Car. tenuipes Dana, 1852 (Indo-West Pacific) ( Ng et al. 2008; Sasaki 2019). Our specimen agrees with the characters of Car. ohashii : (1) first 4 anterolateral teeth with blunt tips, last 3 sharp, tooth 5 largest in Car. ohashii (Fig. 5A; Takeda 1993: figs. 1, 3B, D) (vs. first 5 teeth small and blunt, last 2 sharp, tooth 6 largest in Car. tenuipes ; Dana 1852: pl. 17(4a); Yang et al. 2012: fig. 25a, h); (2) carapace subhexagonal, anterolateral tooth 7 protruding laterally in Car. ohashii (Fig. 5A; Takeda 1993: figs. 1, 3B, D) (vs. carapace subelliptical, tooth 7 slightly protruding laterally in Car. tenuipes ; Dana 1852: pl. 17(4a); Yang et al. 2012: fig. 25a, h); (3) chelipedal palm with surface smooth in Car. ohashii (Fig. 5B; Takeda 1993: figs. 1, 3A, C) (vs. chelipedal palm with 2 ridges and 1 spine on dorsal surface in Car. tenuipes ; Yang et al. 2012: fig. 25a, b, i). Takeda (1993) suggested the brown symmetrical bands and the pattern of spots on the carapace in Car. ohashii ( Fig. 3A View Fig ; Takeda 1993: figs. 1, 3A, B, D) could be used as reliable characters to separate from the uniformly reddish carapace in Car. tenuipes ( Sakai 1976: pl. 110(3); Takeda 1993).

References

Barnard KH. 1950. Descriptive catalogue of South African decapod Crustacea (crabs and shrimps). Ann South African Mus 38: 1 - 837.

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.

Dana JD. 1852. Crustacea, part I. United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842, under the command of Charles Wilkes, U. S. N. C. Sherman, Philadelphia 13: i - viii, 1 - 685.

Fabricius JC. 1798. Supplementum Entomologiae Systematicae. Proft et Storch, Hafniae, 572 pp.

Koch M, Duris Z. 2018. Monomia lucida sp. nov., a new swimming crab (Crustacea: Decapoda: Portunidae) from the South China Sea. Zootaxa 4387: 567 - 579. doi: 10.11646 / zootaxa. 4387.3.9.

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.

Orchard M. 2012. Crabs of Christmas Island. Christmas Island Natural History Association, Christmas Island, Australia, 288 pp.

Sakai T. 1961. New species of Japanese crabs from the collection of His Majesty the Emperor of Japan. Crustaceana 3: 131 - 150.

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.

Shen CJ. 1937. Notes on a collection of swimming crabs (Portunidae) from Singapore. Bull Raffles Mus 13: 96 - 139.

Shih HT, Hsu JW, Huang YH, Chi CY, Chen MW, Hsu PY. 2020 b. Diversity of intertidal and terrestrial brachyuran crabs (Crustacea: Decapoda) from Dongsha Island, Taiwan. J Nat Park 30: 33 - 41. (in Chinese)

Takeda M. 1993. A new swimming crabs of the genus Carupa from submarine caves in the Ryukyu Islands. Bull Nat Sci Mus, Tokyo A (Zool) 19: 145 - 150.

Tan HH, Naruse T, Fujita Y, Kiat TS. 2014. Observations on the fauna from submarine and associated anchialine caves in Christmas Island, Indian Ocean territory, Australia. Raffles Bull Zool 30: 406 - 418.

Walker AO. 1887. Notes on a collection of crustacea from Singapore. J Linn Soc Lond 20: 107 - 117, pls. 6 - 9.

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

Figures

Fig. 3. Species of the family Portunidae. A, Carupa ohashii Takeda, 1993, female (34.9 × 23.1 mm) (NCHUZOOL 16500), Dongsha I.; B, Lupocycloporus minutus (Shen, 1937), male (17.5 × 9.7 mm) (NCHUZOOL 16534), Zuoying, Kaohsiung; C, Lupocyclus inaequalis (Walker, 1887), male (21.6 × 16.3 mm) (NCHUZOOL 16551), Erzihliao Fishing Port, Kaohsiung; D, Lupocyclus tugelae Barnard, 1950, male (17.5 × 13.1 mm) (NCHUZOOL 16560), Erzihliao Fishing Port, Kaohsiung; E, Podophthalmus minabensis Sakai, 1961, male (25.2 × 14.9 mm) (NCHUZOOL 16499), Dalinpu, Siaogang, Kaohsiung; F, Monomia gladiator (Fabricius, 1798), male (53.0 × 31.2 mm) (NCHUZOOL 16506), Erzihliao Fishing Port, Kaohsiung; G, Monomia lucida Koch & Ďuriš, 2018, male (54.8 × 30.7 mm) (NCHUZOOL 16538), Erzihliao Fishing Port, Kaohsiung; H, Xiphonectes tuberculosus (A. Milne-Edwards, 1861), males (24.3 × 14.3 mm) (NCHUZOOL 16530), Zuoying, Kaohsiung.