Dana, 1851
Carapace elongate pyriform, regions moderately convex and covered with tubercles of various sizes, the larger ones being decorated with curled setae. The true rostrum vertical and not very prominent, the pseudorostral horns very long and horizontal, parallel and continuous but divergent at tip. The supraocular eave thick and convergent forwards and is angular at the posterior end. A large orbital sinus, behind which the postocular spine is very prominent and projects obliquely forwards beyond the eyes. The basal segment of antenna is slender and granulated, subtruncate at the distal end; a large tubercle placed on the outer side of the green gland.
Chelipeds are very stout and larger than the legs; arm, wrist and upper border of palm are covered with tubercles. Fingers gape in basal half, the movable finger being armed with a stout tooth near base. Ambulatory legs are very slender and unarmed.
Abdomen of both sexes consists of seven distinct segments. (Sakai, 1938: 231)
Type locality: Puget Sound, Washington, U.S.A.
Range: Japan - off Kinkazan (Rathbun, 1925), Mutsu Bay (Yokoya, 1928), from Tsugaru Strait southwards to Inubo-zaki and Korea Strait (Yokoya, 1933), Akkeshi, Mutsu Bay and Kesen-gun (Sakai, 1938a), Yoichi, Akkeshi, Mutsu Bay, off Choshi, and coast of Noto-jima (Sakai, 1976a), Yamagata Prefecture (Suzuki S., 1979), Kamaishi (Miyake, 1983), Soya Strait (Takeda & Miyauchi, 1992), off Hiroo, Otanoshike, Kitamimonbetsu, and Akkeshi (Komai et al., 1992), Oga (Muraoka, 1998); Korea - Gunsan (Kim, 1970), Daecheong Island, Socheong Island, and Gunsan (Kim, 1973), Cheju-do (Kim & Chang, 1985); China - Yantai (Shen, 1932), coast of Manchoukuo (Sakai, 1938a), Yellow Sea (Sakai, 1938a), Gulf of Bohai (Dai & Yang, 1991); East China Sea (Takeda & Miyake, 1969e); North America - Puget Sound (Dana, 1852), Coastline from Behring Sea to California (Rathbun, 1925), Vancouver Island (Bate, 1865).