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(de Haan, 1835)

The carapace of this species is more convex than in Hemigrapsus sanguineus, more markedly depressed on hepatic and postero-lateral borders. The three antero-lateral teeth are broadish and the postero-lateral facet well defined. The front is just half as broad as the carapace, and its free margin usually sinuate in the middle position. The chela of male has a patch of soft hairs on inner and outer surfaces near the base of the fingers; in female and juvenile male, the chela is devoid of hairs. (T. Sakai, 1939: 673)

Type locality: Japan.
Range: Japan - (de Haan, 1835), Ohshima (Miers, 1886), Tokyo Bay, Sagami Bay and Nagasaki (Ortmann, 1894a), Shimoda (Stimpson, 1907), Mutsu Bay (Yokoya, 1928), Shimoda (Sakai, 1935), Akkeshi, Muroran, Hakodate, Mutsu Bay, Iwate Prefecture, Tateyama Bay, Tokyo Bay, Misaki, Shimoda, Ise Bay, Kii Peninsula, Tosa Bay, Miyazaki Prefecture and Nagasaki (Sakai, 1939), Sagami Bay (Sakai, 1965b), from Akkeshi, Hokkaido, southwards to Kyushu and Okinawa (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Yamagata Prefecture (Suzuki S., 1979), Nanki Shirahama (Miyake, 1983), Oshoro, Usujiri, Hakodate Bay, Akkeshi, Saloma Lake, and Ohmu (Komai et al., 1992); Korea - (Sakai, 1976a), Jinsen (Sakai, 1939), Heian-hokudo, Kokai-do, Chusei-nando, Zenra-nando, Keisho-nando, Keisho-hokudo, Kankyo-nando and Kankyo-hokudo (Kamita, 1941), East Sea, Korea Strait, Cheju-do, and Yellow Sea (Kim, 1973), Cheju-do (Kim & Chang, 1985); Taiwan - (Sakai, 1976a), Tan-shui (Sakai, 1939, Lin, 1949); China - Liaodong Peninsula, Bo Hai Gulf, and Shandong Peninsula (Shen, 1932), Dairen (Sakai, 1939), Tsimei and Xiamen (Shen, 1940b), Guangdong, Fujian, Zhejiang, Jiangsu, Shandong Peninsula, Bo Hai Gulf, and Lioadong Bay (Dai & Yang, 1991); Hawaiian Islands - Laysan Island (Edmondson, 1959); between high and low tidal marks.

Hemigrapsus penicillatus