Ortmann, 1892
The carapace is as long as broad, its upper surface is covered with granules of various sizes. The cardiac and intestinal centers are convex and developed into a high tubercle. The hepatic regions are also convex and tubercular. The front deeply emarginate and defined posteriorly from the gastric region by a transverse depression. The lateral angles of the branchial regions are rounded, they are sometimes, and almost always in the female, armed with a larger tuberculiform tooth. The posterior border is straight and is armed with a low lobule on each side.
The chelipeds of the male are very long, more than twice as long as the carapace; the arm is granulated on both sides but the remaining segments are smooth. The propodus of the ambulatory legs are slender in the female, but in the male it is compressed and has a tooth in the middle of the posterior border.
Abdomen of the male consists of four pieces; the first two terga are short and laterally spinulated, the third to sixth terga are fused together; having a median spinule near the distal end of the sixth tergum. The terminal segment is very narrow and strongly elongated. The abdomen of the female consists of four pieces, the third to sixth terga being fused together. (Sakai, 1937)
Type locality: Sagami Bay, Japan.
Range: Japan - Sagami Bay, Katsuyama and Maizuru (Ortmann, 1892), Muroto-misaki, Suruga Bay, Bungo Strait, Omae-zaki, Goto-retto, between Simonoseki and Tsushima, Nagato, and Wakasa Bay (Yokoya, 1933), Shimoda (Sakai, 1935), Sagami Bay and Shimoda (Sakai, 1937a), Sagami Bay (Sakai, 1965b), near Tsushima and Genkai-nada (Takeda, 1973c), Miura Peninsula, Sagami Bay and Shimoda (Sakai, 1976a), Shiono-misaki (Takeda, 1979a, Miyake, 1983), Suruga Bay (Takeda, 1997), Manazuru, Shimoda and Tosa Bay (Muraoka, 1998); East China Sea (Takeda & Miyake, 1970a, 1972); Australia - southern Queensland (Campbell, 1971), Cape Moreton (Griffin, 1972); 30-307 m.