Sphenomerides trapezioides (Wood-Mason,

Padate Sherine Sonia Cubelio Masatsune Takeda, Vinay P., 2021, Rare deep-water crabs (Crustacea: Decapoda) from Indian waters, with description of one new species, Nauplius (e 2021034) 29, pp. 1-21 : 16

Sphenomerides trapezioides (Wood-Mason,

1891)

( Fig. 9 )

Sphenomerus trapezioides Wood-Mason in Wood-Mason and Alcock, 1891: 263 (type locality: between North and South Sentinel Islands, Bay of Bengal. — Wood-Mason, 1892: pl. 5, fig. 2. — Alcock, 1898: 228. — Poupin et al., 2018: 108 (basionym).

Sphenomerides trapezoides [sic] — Serène, 1968, 89. — Serène, 1973: 207, figs. 6, 27, 28, pl. 5A–D. — Serène, 1984: 289, fig. 196, pl. 42D. — Castro et al., 2004: 34 (in key), 60, pl. 4, fig. E. — Ng et al., 2008: 185 (list). — Castro, 2013: 461, fig. 2F–H. Material examined. 1 female (CL 6.9 mm, CW 9.4 mm) (IO/SS/BRC/00299), Bay of Bengal off Great Nicobar Island, FORVSS stn. 28037, 6.64°N 93.68°E, depth 271 m, coll. Dr. Vinu Jacob, Expo model trawl, 24 September 2010.

Remarks. Sphenomerides trapezioides was described from a male specimen (8.5 × 11 mm) collected off the west coast of the Andamans at 403–439 m depths (Wood-Mason and Alcock, 1891), and subsequently figured by Wood-Mason (1892: pl. 5 fig. 2). Alcock (1898) provided a brief description based on additional specimens from the Andaman Sea. Serène (1973) reported one male and two female specimens from the Indonesian reefs, supplemented with line illustrations of the P4 dactylus and G1, and photographs of carapace and chelipeds. Serène (1984) studied a large collection from Madagascar supported with a line illustration of the G1 and a photograph of the dorsal habitus. Castro et al. (2004) provided details on the synonymy, morphological diagnosis, and notes on the geographical distribution. Castro (2013: fig. 2G) reported the first evidence of S. trapezioides living inside a siliceous sponge, as well as the presence of mucus-gathering setae typical of the family Trapeziidae ( Castro, 2013: fig. 2H).

Distribution. Bay of Bengal, off Andamans at 403– 439 m depth (Wood-Mason and Alcock, 1891) and Nicobars at 271 m (present study), Andaman Sea at 238–531 m ( Alcock, 1898), Haruku Island, Indonesia at 138–152 m and Madagascar at 220–362 m (Serène, 1984; Castro, 2013).

Figures

Figure 9. Sphenomeridestrapezioides (Wood-Mason, 1891), female (CL 6.9 mm,CW 9.4 mm) (IO/SS/BRC/00299), Bay of Bengal off Great Nicobar Island,India.A, Dorsalhabitus;B, ventral viewindicating the position ofantennules, antennae andthird maxilliped; C, pleon and telson, ventral view; D, gonopores, enlarged view. Scale bars: A = 5 mm, B–D = 1 mm.