Sakai, 1965
The carapace is rather strongly convex antero-posteriorly, provided with some tufts and rows of plumose hairs and with sparse short pubescence; the surface is ill-defined and slightly roughened near the antero-lateral borders by minute granules and granular ridges, the remainder of the surface being smooth and glossy. The front is declivous, truncated and bears a small median sinus but no lateral lobule; it is continuous to the supraorbital border through only a faint dorsal depression.
The antero-lateral border is armed with four teeth; the external orbital angle itself is not produced at all; the first is a mere granulated ridge, less prominent and confluent with the external orbital angle; the following three teeth are capped each by a small but sharp, curved spine, of which the anteriormost is most strongly procurved. The subhepatic region is granulated, some granules being visible from above.
The chelipeds are distinctly unequal in both sexes. In the larger cheliped the outer surface of the carpus and the upper and outer proximal surfaces of the merus are thickly covered with small granules and a short tomentum mixed with sparse longish hairs. The lower and outer greater surfaces of the larger palm are glossy. The smaller cheliped is clothed with a dense tomentum mixed with some longish hairs on the outer surfaces of the carpus and palm.
The ambulatory legs are comparatively long and unarmed. Each merus is sparsely covered with hairs. The other segments are more densely clothed than the merus. (Takeda & Miyake, 1969c)
Type locality: Sagami Bay, Japan.
Range: Japan - Shimoda and Nanki Shirahama (Sakai, 1939), Sagami Bay (Sakai, 1965b), Sagami Bay, Manazuru, Shimoda, and Nanki Shirahama (Sakai, 1976a), Munakata-Oshima Islet, Fukuoka Pref., Amakusa-shoto, Amami-Oshima, Tokuno-shima, Kikai-jima, Kume-jima, Ishigaki-jima, and Iriomote-jima (Takeda & Miyake, 1969c); Korea - Cheju-do (Kim & Chang, 1985); China - Guangxi (Dai & Yang, 1991); Palau (Takeda & Miyake, 1969c); Solomon Islands - Bougainville Island (Takeda & Nunomura, 1976); Vanuatu - Santo (Takeda & Nunomura, 1976); Fiji (Takeda & Miyake, 1969c).