Bathypilumnus sinensis ( Gordon, 1930 )

Arzivian, Arteen, Alrubaie, Ahmad, Yang, Jessica, Lin, Huiyu, Zhang, Eva & Leong, Rupert, 2022, Crabs (Crustacea, Decapoda) from the Seas of East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 4. South China Sea, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (4), pp. 147-191 : 170-171

Bathypilumnus sinensis ( Gordon, 1930)

( Fig. 11A–B )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 45, 1 8 (CB 8.7×CL 7.0 mm), NSMT-Cr 30933.

Remarks. The female specimen examined agrees well with the descriptions and figures given by Gordon (1930, 1931, as Pilumnus ), Ng and Tan (1984, as Bathypilumnus ), Dai and Yang (1991, as Pilumnus ), and Yang and Dai (1994, as Pilumnus ). The carapace is robust in appearance, vaulted in both directions, with the ill-defined surface covered with stiff longish setae, the chelipeds are stout, and different in size but similar in the armature, with some rows of equidistant long, curved spiniform tubercles on both carpi and palms ( Fig. 11A–B ).

In the third part of this study ( Takeda et al., 2022b), Bathypilumnus pugilator (A. Milne-Edwards, 1973) was recorded from the Sahul Shelf, which is one of three congeneric species. In B. sinensis , the cheliped armature is characteristic, somewhat in the form of mushroom-shaped tubercles, and in all the species, the male abdomen is narrow, with the long and straight G1 different from the so-called sigmoid Pilumnus - type.

Distribution. Ng and Tan (1984) mentioned the distributional range from the Laccadive Archipelago to the Gulf of Thailand, Hong Kong, and the South China sea, bathymetrically from 21 to 115 m. Yang and Dai (1994) recorded a female from the Nansha Islands as Pilumnus .

Figures

Fig. 11. A–B: Bathypilumnus sinensis (Gordon), 8 (NSMT-Cr 30933; CB 8.7×CL 7.0mm) from sta. 45. C: Eumedonus niger H. Milne Edwards, Ə (NSMT-Cr 30935; CB 7.5×CL 7.7mm) from sta. 50. D: Incultus tuberculosus (A. Milne-Edwards), 8 (NSMT-Cr 30928; CB 25.3mm with epibranchial tubercles, CL 14.5mm) from sta. 45. E: Retropluma denticulata Rathbun, Ə (NSMT-Cr 30943; CB 7.8×CL 6.6 mm) from sta. 42. F: Lupocyclus philippinensis Semper, Ə infested by a Sacculina (NSMT-Cr 30924; CB 20.5mm including lateral teeth, CL 17.0mm including frontal teeth) from sta. 45.