Ortmann, 1893
The general outline of carapace of this species is subtriangular and thickly covered with granules; the hepatic, branchial and intestinal regions are less convex. The gastric region is armed with two spines in the median line, the cardiac region with two prominent ones side by side. The posterior margin has also two erect spines, one on either side. The hepatic region is armed with two lateral spines, of which the posterior one is small. The branchial region has three marginal and one mesobranchial spine, they are uniformly prominent and sharply-cut.
The pseudorostral spines are markedly divergent near the tip and are very slightly upcurved or incurved. The postocular tooth is strongly produced and its tip bifid. The arm and palm of chelipeds are covered with sharp tubercles, some of which on the upper border are larger and spiniform. The ambulatory legs are slenderer than those of Leptomithrax edwardsi, each segment being furnished with longish hairs but fewer in number. (Sakai, 1938: 303)
Type locality: Sagami Bay, Japan.
Range: Japan - Sagami Bay (Ortmann, 1893), Sagami Bay, Suno-saki, Suruga Bay, Omae-zaki, Ashizuri-misaki, Goto-retto, Tsushima and Iki (Yokoya, 1933), Shimoda (Sakai, 1935), Tateyama Bay, Sagami Bay, Gobo and Goto-retto (Sakai, 1938a), Sagami Bay (Sakai, 1965b), south off Tsushima and Genkai-nada (Takeda, 1973c), Tokyo Bay, Sagami Bay, Wagu, Kii Nagashima, Kii Minabe, Tosa Bay, and Nagasaki (Sakai, 1976a), Ogasawara-shoto (Takeda & Kurata, 1976b), Yamagata Prefecture (Suzuki S., 1979), Sagami Bay, Suno-saki, Tsushima Strait and Nagasaki (Griffin & Tranter, 1986a), Sagami Bay, Mikawa Isshiki, Wagu, Kii Nagashima, Kii Minabe, Tosa Bay and Matsuyama (Muraoka, 1998); Korea - Cheju-do (Kim, 1970, 1973); 36-540 m.