(de Haan, 1837)
The carapace is transversely suboval in outline, the dorsal surface smooth and flattish but moderately vaulted down from side to side and slightly so toward the front. The fronto-orbital and lateral surfaces are covered with tubercles with setae. The front is divided into two lobes by a rather deep median notch, each lobe being again shallowly bilobate and setose; the preorbital tooth is entirely fused with the frontal lobe. Antero-lateral borders are rounded and almost entire, thickly covered with granules and silky hairs; there is a very indistinct indentation some distance posterior to the external orbital angle. Chelipeds are subequal in size but usually unequal in the shape of the fingers. The superior border of wrist bears numerous sharpish granules; the palm is weakly compressed and the upper and lower borders rounded; the fingers of one cheliped is very often longer than those of the opposite cheliped; in a very young specimen, the movable finger is usually very much more curved inward than in the adult. The ambulatory legs are thickly fringed with yellow, silky hairs; the dactylus of each pair is blade-shaped and recurved. (T. Sakai, 1939: 429)
Type locality: Japan.
Range: Mauritius (Bouvier, 1915b, Michel, 1964); Salomon Island, Chagos Archipelago (Rathbun, 1911); Andaman Islands (Alcock, 1899a); Japan - Shimoda (Sakai, 1935), Tateyama Bay, Shimoda, Nanki Shirahama and Nagasaki (Sakai, 1939), Sagami Bay (Sakai, 1965b), from Tokyo Bay to Nagasaki (Sakai, 1976a), Ogasawara-shoto (Takeda, 1977a), Yamagata Prefecture (Suzuki S., 1979); Taiwan; China - Fujian (Dai & Yang, 1991); Philippines.