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(de Haan, 1835)

Carapace is covered with soft tomentum interspersed with fewer longish hairs; the regions are only faintly demarcated. The front bilobate, the free edge of each lobe is finely granulated and is laterally marked by a lobule, from which the preorbital angle is well separated. Antero-lateral borders are scarcely arcuate, cut into four teeth, which are acuminately spine-tipped and directed obliquely forward. Chelipeds are unequal, the distal surface of wrist and entire outer surface of palm are elegantly covered with a thick pavement of squamiform tubercles, the pavement is so complete that the proper surface of these segments is entirely concealed. Ambulatory legs are rather slender and covered with soft tomentum, interspersed with longish hair. (T. Sakai, 1939: 527)

Type locality: Japan.
Range: India - Palk Strait (Alcock, 1898); Sri Lanka (Alcock, 1898); Japan - (de Haan, 1835), Tokyo Bay (Miers, 1879b, Balss, 1922c), Sagami Bay (Ortmann, 1893, Sakai, 1965b), Uraga-suido (Parisi, 1916), Nagasaki (Balss, 1922c), from between Shioya-zaki and Inubo-zaki southwards to Tanegashima, around Koshiki-jima and Goto-retto, from Tsushima and Iki northwards to Mishima, off Yamaguchi Pref. (Yokoya, 1933), Shimoda (Sakai, 1935), Tateyama Bay, Sagami Bay, Shimoda, Nanki Shirahama, Gobo and Nagasaki (Sakai, 1939), Ariake-kai (Miyake, 1961), Yahatahama, Ehime Pref., Amakusa-shoto, Nagasaki, Fukuoka Prefecture and Tottori Prefecture (Takeda & Miyake, 1969c), Genkai-nada (Takeda, 1973c), from Boso Peninsula to Kyushu (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Tanabe (Miyake, 1983), Manazuru, Shimoda, Mikawa Isshiki, Kii Nagashima, Kii Minabe, Tosa Bay, Amakusa, and Yoron-jima (Muraoka, 1998); China Sea between Taiwan and Chinese coast (Stimpson, 1907); Taiwan; Gulf of Thailand (Rathbun, 1019); Singapore (Walker, 1887, Nobili, 1903c); Philippines (Miers, 1886); Australia - Moreton Bay (Campbell & Stephenson, 1970); littoral to 35 m.

Actumnus squamosus