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(de Haan, 1833)

Carapace covered with a velvety coat of tomentum but usually not with longer hairs; the dorsal surface is extremely convex and the regions rather clearly defined. The frontal lobes are markedly deflexed, the antero-lateral borders are extremely arcuate and cut into four teeth, the tips of which are acuminate on denudation; the postero-lateral borders are extremely concave, in which concavity the last pair of ambulatory legs fit when retracted. Chelipeds are markedly unequal and covered with velvety tomentum, the wrist and palm are covered with beaded granules, the dispositions of which are irregular and not at all concealed by the tomentum. Merus, carpus and propodus are very broad and convex, the anterior and posterior borders being thickly fringed with hairs. (T. Sakai, 1939: 528)

Type locality: Japan.
Range: Red Sea (Klunzinger, 1913, Laurie, 1915); Zanzibar (Nobili, 1906); ? South Africa - St. Lucia Bay (Barnard, 1947); Seychelles (Rathbun, 1911); Mauritius (Richters, 1880); Persian Gulf (Alcock, 1898, Nobili, 1906, Stephensen, 1945); India - Orissa Coast and Palk Strait (Alcock, 1898); Sri Lanka (Alcock, 1898, Laurie, 1906); Maldives (Borradaile, 1902b); Burma - Cheduba Island (Alcock, 1898), Gulf of Martaban (Henderson, 1893); Andaman Islands (Alcock, 1898); Mergui Archipelago (de Man, 1887b, Alcock, 1898); Malay Peninsula - Pinang (Lanchester, 1902); Japan - (de Haan, 1833), Tokyo Bay and Kagoshima (Ortmann, 1893), Sagami Bay (Calman, 1900, Sakai, 1965b), Sagami Bay and Nagasaki (Balss, 1922c), Suruga Bay (Yokoya, 1933), Shimoda (Sakai, 1935), Tateyama Bay, Shimoda, Nanki Shirahama and Nagasaki (Sakai, 1939), Ariake-kai (Miyake, 1961), Tosa Bay, Amakusa-shoto, Nagasaki, off Tsuyazaki and Ishigaki-jima (Takeda & Miyake, 1969c), from Boso Peninsula to Kyushu (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Mage-jima, Kagoshima Prefecture (Takeda, 1977b), Kii Nagashima (Miyake, 1983), Oshima Passage, Amami-Oshima (Takeda, 1989), Suruga Bay (Takeda, 1997); China - Hong Kong (Alcock, 1898), Hainan Island (Shen, 1936, 1940), Guangdong and Fujian (Dai & Yang, 1991); Macclesfield Bank (Pocock, 1890); Gulf of Thailand (Rathbun, 1910a); Singapore (Walker, 1887); Philippines - Corregidor Island (Miers, 1884a); Indonesia - Edam Island, Java Sea (de Man, 1887d), Halmahera (de Man, 1902a); Australia - Albany Passage (Haswell, 1882c), Thursday Island, Port Denison, Percy Islands and Sir C. Hardy's Islands, Queensland (Miers, 1884a), Thursday Island (Ortmann, 1894), Torres Strait (Calman, 1900), Masthead Island (Grant & McCulloch, 1906), Shark Bay, Western Australia (Miers, 1884a, Balss, 1933b), Monte Bello Islands (Rathbun, 1914c), Cape Jaubert (Rathbun, 1924c), north-west of Cape Jervis and Kangaroo Island, S. Australia (Rathbun, 1923a), Moreton Bay (Campbell & Stephenson, 1970); New Caledonia (A. Milne Edwards, 1873, Takeda & Nunomura, 1976); Vanuatu (Miers, 1884a); Fiji (Miers, 1884a); Samoa (Ortmann, 1893, Alcock, 1898); Tahiti (A. Milne Edwards, 1865); Tahiti or Samoa (Dana, 1852); littoral to 50 m.

Actumnus setifer