de Haan, 1833
The carapace has, at the epibranchial angle, a tooth or a crest emphasized on the inside by a furrow. The chelipeds have the crest on the superior margin of the palm clearly defined and generally protruding. The epibranchial angle of the carapace never has a tooth, the crest of the antero-lateral margin is continuous with the postero-lateral margin. The carapace, chelipeds and legs have their surfaces marked with rugosities forming an irregular reticulation. The frontal margin is nearly straight with a feeble median fissure. The first pleopod of the male has been figured by Gordon (1934, fig. 16b). (Serène, 1984)
Type locality: Japan.
Range: Japan - (de Haan, 1835), Tokyo Bay (Ortmann, 1893), Shimoda (Sakai, 1935), Ajiro and Shimoda (Sakai, 1939), Sagami Bay (Sakai, 1965b), Oga Peninsula, Sagami Bay, Shimoda, Wagu, Kii Nagashima, Kii Minabe, Tosa Bay, and Nagasaki (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Yamagata Prefecture (Suzuki S., 1979), Noto (Miyake, 1983), Toyama Bay, coast of Echizen; Korea - Cheju-do (Kamita, 1941), Jeju, Seogwipo, Gapa Island, and Hae-undae (Kim, 1970, 1973), Cheju-do (Kim & Chang, 1985); Taiwan (Lin, 1949); China - Xiamen (de Man, 1879), Hainan Island (Shen, 1936, 1940), Guangdong, Fujian and Zhejiang (Dai & Yang, 1991); littoral to 20 m.