Samadinia boucheti ( Ng and Richer de Forges, 2013 )

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 : 17-18

Samadinia boucheti ( Ng and Richer de Forges, 2013)

( Fig. 6C )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 27 (Timor Sea; 09°30.9′S, 127°56.6′E, 465–490 m depth), 3 m beam trawl; June 24, 1972; 1 ♀ (NSMT-Cr 29266: CB 12.4 mm, CL 18.3 mm excluding pseudorostral spines).

Remarks. The genus Rochinia A. Milne-Edwards, 1875 was formerly a catchall genus in the family Epialtidae . Ng et al. (2008) restricted Rochinia to 34 species, and subsequent taxonomic revisions removed all species, except R. gracilipes A. Milne-Edwards, 1875 (type species), to other genera (see Tavares and Santana, 2018; Lee et al., 2020).

Ng and Richer de Forges (2013) established the genus Samadinia for S. longispina Ng and Richer de Forges, 2013 from French Polynesia and New Caledonia. They recognized five groups in the remaining Rochinia ( Ng et al., 2008) . Very recently, Samadinia was redefined by Lee et al. (2021) to include the species of the fourth and fifth groups of Rochinia s.l., which share distinct carapace regions, spined or granulated carapace surface, transversely narrow, anteriorly constricted male thoracic sternum, and acutely triangular or T-shaped male pleon. Thus, Samadinia is distinguished from Rochinia by the combination of the poorly defined carapace regions, numerous small, rounded granules on the carapace dorsal surface, the often long, sharp, laterally-directed hepatic and lateral branchial spines, broad triangular pleon with pleomeres 3 and 4 broadly trapezoidal and pleomeres 5 and 6 subrectangular. At present, Samadinia is comprised of 26 species from the Indo-West Pacific, including R. miyakensis Takeda and Marumura, 2014, from Japan.

A female examined ( Fig. 6C ) agrees well with the original description of R. boucheti that can be distinguished from congeners by having numerous small spines on the carapace dorsal surface and relatively short pseudorostral spines.

Distribution. The type locality is the Solomon Islands, 371–766 m depth, and then, Lee et al. (2019) recorded many specimens from Papua New Guinea, 382–743 m depth. The present bathymetric record from the Timor Sea, 465– 490 m, is the third for this species.

Figures

Fig. 6. A–B: Laubierinia carinata (Griffin and Tranter), female (NSMT-Cr 29265: CB 11.1mm×CL 17.2mm excluding pseudorostral spines) from sta. 28 (Timor Sea, 295–296m depth). C: Samadinia boucheti (Richer de Forges and Ng), female (NSMT-Cr 29266: CB 12.4mm×CL 18.3mm including pseudorostral spines) from sta. 27 (Timor Sea, 465–490m depth). D–E: Samadinia soela (Griffin and Tranter), female (NSMT-Cr 29267: CB 6.0mm excluding branchial spines×CL 9.7mm excluding pseudorostral spines) from sta. 26 (Timor Sea, 610–690m deep).