Cyrtomaia suhmii Miers, 1886

Cyrtomaia suhmii Miers, 1886 View in CoL

( Fig. 7 View Figure 7 )

Cyrtomaia suhmii Miers, 1886: 16 View in CoL , pl. 3, fig. 2, 2a–c (type locality: off Tulur Islands, South China Sea, 4°33’0”N 127°6’0”E). — Rathbun, 1918: 6 (remarks). — Richer de Forges and Guinot, 1990: 525, 527 (discussion). — Richer de Forges and Ng, 2007: 56 (list). — Ng et al., 2008: 111 (list). — Promdam, 2011: 7, figs. 1, 2A–F.

Cyrtomaia suhmi — Rathbun, 1893:230 (remarks).— Griffin, 1974: 9. — Guinot and Richer de Forges, 1981b: 1096 (remarks). — Guinot and Richer de Forges, 1982: 16 (key), 21, figs. 10, 11A–B, 23B. — Guinot and Richer de Forges, 1985: 116, figs. 11B, 12A, B, 14 A–C, pl. V, fig.A–D, F–I. — Griffin and Tranter, 1986a: 24 (key), 30, fig. 9e–g. — Griffin and Tranter, 1986b: 352, figs. 1, 2. — Richer de Forges and Guinot, 1988: 42–44 fig. 2B, C, pl. 2F, G. — Poore, 2004: 360 (key), 361, fig. 108g. — Richer de Forges and Ng, 2007: 62 (remarks).

Cyrtomaia Suhmi View in CoL var. curviceros Bouvier, 1915: 9–15 View in CoL , pl. 1.

Cyrtomaja suhmi typica — Serène and Lohavanijya, 1973: 45, 46 (key).

Cyrtomaja suhmi curvicornis —Serène and Lohavanijya, 1973: 45, 46 (key).

Cyrtomaia curviceros View in CoL — Sakai, 1976: 176 (key), 181. — Guinot and Richer de Forges, 1981b: 1096 (remarks). — Guinot and Richer de Forges, 1982: 24, fig. 12A–D. — Richer de Forges and Guinot, 1988: 42, 43 (remarks), fig. 2A. — Ng et al., 2001: 13, 54, 75, 81, fig. 3h. — Richer de Forges and Ng, 2007: 56 (list), 62, 63 (remarks).

Material examined. 1 male ( PCL 67.1 mm, CW 78.5 mm) ( IO /SS/BRC/00298), off Great Nicobar Island , Bay of Bengal, FORVSS stn. 28037, 6.64°N 93.68°E, 271 m, coll. Dr. Vinu Jacob, Expo model trawl, 24 September 2010 GoogleMaps .

Remarks. Cyrtomaia suhmii was originally described from a damaged male specimen (25 × 28mm) collected from the South China Sea, Indonesia at 915 m depth during the HMS Challenger Expedition ( Miers, 1886). Doflein (1904) recognized two subspecies from the “Valdivia” collections in the Nicobar Islands, Indonesia ( C. suhmi typica ) and the Western Indian Ocean ( C. suhmi platyceros ) based on the differences in the form of carapace, rostrum, female pleon as well as the carapace ornamentation and texture. Bouvier (1915) recognized a separate subspecies from Japan, C. suhmi curviceros based on arched pseudorostral and gastric spines, and poorly developed branchial spines. Serène and Lohavanijaya (1973) provided a key to the species and subspecies of the genus Cyrtomaia including these subspecies. Griffin (1974) reported this species from the Andaman Sea off Thailand, along with morphological differences from the holotype with respect to the armature of the carapace and the basal antennal article. He also elaborated upon its synonymy and morphological relationships with congeners. Griffin and Brown (1976) reported a large female from Australian waters having long protogastric spines, one supraorbital spine and one mesogastric spine. Sakai (1976) elevated C. suhmi curviceros to a distinct species. Guinot and Richer de Forges (1982) redescribed the holotype, attempted to resolve the taxonomic status of several of its subspecies, and compared other published descriptions with the holotype. They also elevated C. suhmi typica to a distinct species, C. gaillardi . Guinot and Richer de Forges (1985) reported morphological similarities of specimens collected during the MUSORSTOM I and II expeditions in the Philippines to both C. suhmi and C. curviceros and emphasized upon reviewing the identity of C. curviceros . Griffin and Tranter (1986a) suggested that C. suhmi curviceros is an adult stage of C. suhmi and synonymized it with the latter. Griffin and Tranter (1986b) reported specimens from Australian waters and the Straits of Malacca having a large adult size, smooth carapace, and a short eyestalk. Richer de Forges and Guinot (1990) established a new species, Cyrtomaia griffini , based on the material collected off the eastern coast of Australia, also including previously published reports ( Griffin and Brown, 1976; Griffin and Tranter, 1986a; 1986b). Promdam (2011) reported this species in the Andaman Sea off Thailand and corroborated C. curviceros to be a synonym of C. suhmii on the basis of both adult and juveniles resembling these taxa, respectively.

The present specimen ( Fig. 7A, B, E View Figure 7 ) largely agrees with the original description by Miers (1886), the holotype specimen (see Guinot and Richer de Forges, 1982: figs.11A–B, 23B; Richer de Forges and Guinot, 1988: fig.2B,C), the Philippine specimens (see Guinot and Richer de Forges, 1985: figs. 11B, 12, 14A), line diagram of G1of male specimen from Tasman Sea (see Griffin and Tranter, 1986a: fig. 9e–g), the Western Australia specimen ( Griffin and Tranter, 1986b: figs. 1, 2), and the Thailand specimen (see Promdam, 2011: figs. 1, 2D). However, it differs from the southeastern Arabian Sea specimens in Alcock’s report, in the presence of spine on the “last abdominal tergum” ( Fig. 7D View Figure 7 ) (vs. smooth tergum in the latter specimens in Alcock’s report).

Distribution. Indonesia at 915 m depth ( Miers, 1886), Japan, Taiwan, Andaman Sea off Thailand at 502–512 m ( Griffin, 1974) and southeastern Bay of Bengal at 271 m (present study).