(de Haan, 1837)
A rather small species; the pseudorostral spines are divergent at an angle of about 60° and their length more than one fourth that of the carapace proper. The preocular spines acuminate, prominent; the postocular spines entirely continuous with the hepatic lobes, forming a wing-like outgrowth on either side of the carapace. The epibranchial spine conical, prominent, projecting upwards and backwards. The gastric tubercle is small, while the cardiac region is markedly convex and conical; the intestinal tubercle is moderately prominent.
Chelipeds are compressed, the merus prismatic, having three wing-like crests, the crests of wrist and palm are also moderately prominent. Ambulatory legs are compressed, the merus with a crest on anterior border, which is fringed with knobbed hairs, the next three segments also with hairs on anterior and posterior borders. (Sakai, 1938: 254)
Type locality: Japan.
Range: Japan - Yokosuka (Miers, 1886), Tokyo Bay, Tanagawa and Kagoshima (Ortmann, 1893), Hakodate Bay (Stimpson, 1907), Mutsu Bay (Yokoya, 1928), east of Honshu and Tugaru Strait (Yokoya, 1933), Tateyama Bay, Ise Bay, Onomichi and Nagasaki (Sakai, 1938a), Sagami Bay (Sakai, 1965b), Tsushima Strait (Takeda, 1973c), from Hakodate, Aomori Bay southwards to coasts around Kyushu (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Genkai-nada, Hirado and Nagasaki (Griffin & Tranter, 1986a); Korea - Reisui market (Kamita, 1941), Cheju-do (Kim, 1973); East China Sea (Takeda & Miyake, 1969e); China - Xiamen (Shen, 1940b), Fujian (Dai & Yang, 1991); Taiwan Strait (Griffin & Tranter, 1986a); 20-72 m.