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(de Haan, 1835)

Carapace narrowed in the fore part. Front about one-third of the greatest breadth of the carapace, anterior margin with 4 teeth, the middle pair bluntly rounded, the lateral tooth sharp. Postfrontal processes not sharper than in Eriocheir rectus. Dorsal orbital border with a suture, outerorbital angle acute. Antero-lateral margin with 4 teeth including the outerorbital one; the last tooth reduced.
Chelipeds stout. Merus trigonal, inner-ventral border setose. Carpus with a spine at its inner-distal angle. Palm thickly covered with long hairs on both surfaces, extending to the distal end of the carpus and to the base of the two fingers. Inner borders of the two fingers with blunt teeth. Merus of the ambulatory legs with setae on the anterior border; anterior border of the carpus and both the anterior and the posterior borders of the propodus with brown bristles; dactylus with short setae on both the anterior and the posterior borders. Carapace length of the male 56 mm, breadth 61 mm. (Dai & Yang, 1991)

Type locality: Japan.
Range: Vladivostok; Sakhalin (Sakai, 1939); Japan - (de Haan, 1835), Tokyo Bay and Nagasaki (Ortmann, 1894a), Hakodate Bay (Stimpson, 1907), Mutsu Bay (Yokoya, 1928), Shimoda (Sakai, 1935), Mutsu Bay, Sagami Bay, Shimoda, Hamamatsu and Ise Bay (Sakai, 1939), Hachijo-jima (Sakai, 1954), Sagami Bay (Sakai, 1965b), Hokkaido, Honshu, Shikoku, Kyushu and Okinawa (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Yamagata Prefecture (Suzuki S., 1979), Kuroshima, Yaeyama-retto (Miyake, 1983), Oshoro, Hakodate, and Ueiso, Hokkaido (Komai et al., 1992), Sakyo-numa, Hokkaido, Hachijo-jima, Ogasawara-shoto, Sagami Bay, Miura Peninsula, and Gobo (Muraoka, 1998), Ginowan, Okinawa (Shokita et al., 2000); Korea - Genzan, Chinkai and Cheju-do (Sakai, 1939), Cheongjin, Immyeong, Samho, Hamheung, Hong-weon, Yeongheung, Songjeong Bay, Wonsan, Gojeo, Uljin, Yeonghae, Yeon-il, Gunwi, Gumi, Samrangjin, Geoje Island, jinhae, Tong-yeong, jinju, Suncheon, Dong-gang, Jeju, Jungmun, and Seogwipo (Kamita, 1941), Bangjugpo and Seogwipo (Kim, 1973); China - Fujian and Guangdong (Dai & Yang, 1991); Taiwan - (Dai & Yang, 1991), Tan-shui and Kaohsiung (Sakai, 1939), Chi-lung, Sinten, Yüan-lin, Kueijin, Tan-shui, and Kaohsiung (Lin, 1949).

Eriocheir japonicus