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de Haan, 1839

Carapace without conspicuous spines dorsally, regions well delimited, postorbital neck short, hepatic lobe smooth, convexity low, branchial regions smooth; supraorbital eave without large spines; rostral spines separated through a U-shaped incision, tips acute. Basal antennal article granulate. Chelipeds of adult male robust, much heavier than the ambulatory legs; merus relatively short and bulging externally; carpus nearly as long as merus; palm swollen, upper border with a longitudinal row of spinules and setae; fingers incurved. Dactyls of last two pairs of ambulatory legs strongly falcate. (Türkay 1995)

Type locality: Japan.
Range: Japan - (de Haan, 1839), Sagami Bay and Tokyo Bay (Ortmann, 1893), Suruga Bay and south of Tsushima (Yokoya, 1933), Shimoda (Sakai, 1935), Tateyama Bay, Manazuru, Shimoda, Nanki Shirahama, Gobo, and Nagasaki (Sakai, 1938a), Sagami Bay (Sakai, 1965b), Tsushima Strait (Takeda, 1973c), Tokyo Bay, Sagami Bay, Shimoda, Kii Nagashima, Kii Minabe, Tosa Bay, and Nagasaki (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Kushimoto (Miyake, 1983), Misaki, north-west of Kyushu, off Honshu, and Obama (Griffin & Tranter, 1986a); Korea - Hae-undae and Seogwipo (Kim, 1973); Hong Kong (Stimpson, 1907); 20-100 m.

Orang-utang crab (Achaeus japonicus)