(Bouvier, 1906)
The carapace is narrower than in any of the congeners. The gastric region has two very long spines in the median line, in front of the anterior one of which the interorbital region has a pair of longitudinal rows of several flat tubercles, and in rear of the posterior gastric spine is a pair of tubercles side by side on the posterior slope. The cardiac region has two spines side by side, the bases of which are close together. The intestinal region has two spines in the median line; the branchial region has a single epibranchial spine, which is very long.
The pseudorostral spines nearly half the length of the carapace, they are very slender and widely divergent at tip. The supraocular eave has two anterior and one posterior spine. Intercalated spine laminar; postocular spine slant or bifurcate at the outer angle. The hepatic region armed with two lateral and three or four ventral tubercles.
The arm of chelipeds somewhat laterally compressed, its upper and lower borders sharply crested, the crest being armed with several laminar teeth; both borders of wrist and the superior border of palm are also cristate and dentate. The meri of the ambulatory legs have a terminal spine on the anterior border.
Abdomen of both sexes consists of seven distinct segments. (Sakai, 1938: 307)
Type locality: Japan.
Range: Japan - Misaki, Wakayama Prefecture and Gobo (Sakai, 1938a), Sagami Bay (Sakai, 1965b, Griffin & Tranter, 1986a), Sagami Bay, Shima Peninsula and Kii Peninsula (Sakai, 1976a), Misaki, Sagami Bay, Kii Nagashima, Gobo, Kii Minabe, Tosa Bay (Muraoka, 1998); East China Sea (Takeda & Miyake, 1969e); 20-540 m.