Ortmann, 1893
Monotypic genus, generic definition repeated:
Carapace oblong and subquadrangular, furrows well marked; lateral borders with three spinules, first one very near to exorbital tooth, last one at junction of antero- and postero-lateral borders; rostrum tridentate. Flagellum of antenna less than half the length of carapace. Eyestalks short and filiform, cornea also very small. Chelipeds extremely heterochelous in male, right chela much larger and heavier than subsequent ambulatory legs. Second to fifth pereiopods smooth, dactyli styliform. (Türkay 1995)
Type locality: Sagami Bay, Japan.
Range: Japan - Sagami Bay (Ortmann, 1894, Sakai, 1939, 1965), Inubo-zaki, Sioya-zaki, Kinkazan, Todo-saki, Boshu, Suruga Bay, Toba, Singu, Kochi, Sagami Bay, Owase, Hamana Lake, Goto-retto, Tsushima, north of Nagato, Oki, off Tottori, Kyogasaki, Wakasa Bay, Toyama Bay, Niigata, Sado, mouth of Mogami-gawa, Oga, Tubaki-zaki, Jusan-gata, and Tsugaru Strait (Yokoya, 1933), Ito and Manazuru (Sakai, 1935), near Tsushima (Takeda, 1973c), Inubo-zaki, Sagami Bay, Kii Minabe, and Tosa Bay (Sakai, 1976a), Yamagata Prefecture (Suzuki S., 1979), off Nojima-zaki, Boso Peninsula (Takeda, 1981a), Maizuru (Miyake, 1983), Suruga Bay (Takeda, 1997); East China Sea (Takeda & Miyake, 1968c); 45-476 m.