Cyrtomaia suhmii Miers, 1886

Islam, Atikul, Banerjee, Abhishek, Wati, Sisca Meida, Banerjee, Sumita, Shrivastava, Deepti & Srivastava, Kumar Chandan, 2022, Crabs (Crustacea, Decapoda) from the Sea off East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 2. Timor Sea, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (1), pp. 5-24 : 13-15

Cyrtomaia suhmii Miers, 1886

( Fig. 5B )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 26 (Timor Sea; 09°27.0′S, 127°58.6′E –09°285.0′S, 127°56.1′E, 610–690 m depth), 3 m beam trawl; June 19, 1972; 1 ♂ with epicaridean parasites in both branchial chambers (NSMT-Cr 29259: CB 31.6 mm excluding branchial spines, CL 26.2 mm excluding pseudorostral spines), 1 ♂ with epicaridean parasite in right branchial chamber (NSMT-Cr 29260: CB 32.7 mm, CL 28.0 mm).

Remarks. Both of the specimens examined are infected by epicaridean parasites; in the smaller male (NSMT-Cr 29259: Fig. 5B ), the branchial chambers of both sides are heavily deformed, and in another, slightly larger male (NSMT-Cr 29160), the right branchial chamber is also strongly bulged.

Takeda et al. (2021) recorded two species of Cyrtomaia , C. horrida Rathbun, 1916 from the Sulu Sea and C. largoi Richer de Forges and Ng, 2007 from the Sibutu Passage, with some taxonomic comments. This species is distinctly different from them in having long protogastric spines. Richer de Forges and Guinot (1988) discussed the differences between the new species, C. coriolisi , and C. suhmii Miers, 1886 , and indicated that there is only a vestigial intercalated granule instead of spinule on the supraorbital border in C. coriolisi . The morphological features other than the deformity of the branchial chambers essentially agree with the descriptions and illustrations by Griffin and Tranter (1986a), Guinot and Richer de Forges (1985), Richer de Forges and Guinot (1990), Promdam (2011), and Padate et al. (2021).

Distribution. Indo-West Pacific, from Japan to Australia and India through the Philippines and Indonesia, 488–1125 m depth. Davie (2002) recorded this species in the Zoological Catalogue of Australia based on the records by Griffin and Brown (1976), Griffin and Tranter (1986a), and Davie and Short (1989).

Figures

Fig. 5. A: Pleistacantha griffini Ahyong and Lee, male (NSMT-Cr 29258: CB 6.7mm×CL 10.2mm excluding pseudorostral spines) from sta. 28 (Timor Sea, 295–296m depth). B: Cyrtomaia suhmi Miers, male infected by epicaridean parasites in both branchial chambers (NSMT-Cr 29259: CB 31.6mm excluding branchial spines×CL 26.2mm excluding pseudorostral spines) from sta. 26 (Timor Sea, 610–690m depth). C–D: Dorhynchus rostratus (Sakai), female (NSMT-Cr 29261: CB 15.2mm×CL 15.0mm excluding pseudorostral spines) from sta. 26 (Timor Sea, 610–690m depth). E: Platymaia fimbriata Rathbun, male (NSMT-Cr 29263: CB 14.0mm×CL 12.6mm excluding pseudorostral spines) from sta. 26 (Timor Sea, 610–690m depth). F: Platymaia wyvillethomsoni Miers, ovigerous female (NSMT-Cr 29264: CB 39.5mm excluding branchial spines×CL 36.7mm excluding pseudorostral spines) from sta. 28 (Timor Sea, 295–296m depth).