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(de Haan, 1833)

Carapace broad (CB/CL about 1.33), surface granulation fairly coarse anteriorly and fine posteriorly; cuticle of same thickness throughout, no translucent areas on posterior half of carapace; antero-lateral teeth large and robust, broad based and narrowly separated; pterygostomial region diffusely granular, no stridulating ridge. Chelipeds subequal, relatively short and robust; anterior border of merus without spines or tubercles; inner spine of carpus long and robust; palm not swollen, lower border with 13-20 coarse, deep striae. Anterior border of carpus of swimming leg sharp and hirsute. (Türkay 1995)

Anterior of carapace finely granular; posterior of carapace without conspicuously thin areas; mesobranchial area of carapace without strongly granular oblique ridge; no conspicuous elevations in mesogastric regions; coarse granules on carinae on upper surface of hands. (Davie 1999)

Type locality: Japan.
Range: Japan - (de Haan, 1833), Tokyo Bay (Ortmann, 1893), Hakodate Bay (Stimpson, 1907), Inubo-zaki (Yokoya, 1933), Shimoda (Sakai, 1935), coast of Iwate Prefecture, Tokyo Bay, Sagami Bay, Shimoda, Ise Bay, Kii Peninsula, Tosa Bay and Nagasaki (Sakai, 1939), Sagami Bay (Sakai, 1965b), east coast of Japan, Osumi, Toyama Bay, Oshoro, and Sagami Bay (Stephenson & Rees, 1968), Nagasaki (Stephenson, 1972a), Oga Peninsula, Inubo-zaki, Tokyo Bay, Sagami Bay, Mikawa Bay, Kii Peninsula, Tosa Bay, Seto-naikai, and Nagasaki (Sakai, 1976a), Yamagata Prefecture (Suzuki S., 1979), Koshiki-jima (Miyake, 1983), Oshoro and Usu, Hokkaido (Komai et al., 1992), Soya Strait (Takeda & Miyauchi, 1992); Korea - Aninjin, off Namcheon Dong, Hae-undae, Yeong-il Bay, and Cheju-do (Kim, 1973); East China Sea (Takeda, 1975a, Baba, 1986); Taiwan - Chi-lung, I-lan Province, and Nanfangao (Huang & Yu, 1997); China - Fuzhou (Shen, 1940b, Stephenson & Rees, 1968); 15-115 m.

Three-spot swimming crab (Ovalipes punctatus)