Stimpson, 1858
Carapace thickly covered with fine granules and pits, but the posterior half of the dorsal surface is almost smooth to the unaided eye. 2M is well demarcated, hepatic surface bears two oblique ridges, the branchial region has two grooves as in Ozius rugulosus but they are much more oblique and the posterior one almost obliterated. Front composed of four obtuse protuberances; antero-lateral borders are divided into five lobes, the first two of which are broad and low, the third and fourth are obtusely tooth-shaped, and the last one very small. Wrist and palm are very swollen and covered with rugae or networks of rugae. (T. Sakai, 1939: 518)
Type locality: Ogasawara-shoto, Japan.
Range: Red Sea (Cano, 1889); South Africa - Kosi Bay (Barnard, 1950); Kenya - Mombasa; Mayotte; Madagascar - Nosy Bé, Tamatave; Mauritius (Bouvier, 1915b, Michel, 1964); Sri Lanka; Andaman Islands (Alcock, 1898); Arakan coast (Alcock, 1898); Nicobar Islands (Heller, 1865); Japan - Ogasawara-shoto (Stimpson, 1858a, 1907, Balss, 1922c, Takeda & Kurata, 1977), Kagoshima and Northern Daito-jima (Sakai, 1939), Hachijo-jima (Sakai, 1954), Kagoshima Bay, Amami-shoto, Yaeyama-retto, Northern Daito-jima, and Ogasawara-shoto (Sakai, 1976a), Tosa Bay, Ogasawara-shoto, Yoron-jima and Okinawa (Muraoka, 1998); Taiwan - (Parisi, 1916), Tainan and Lan-Yü (Sakai, 1939), Nanfangao, Tainan, Lan-Yü, and P'eng-hu (Lin, 1949); China - Paracel Islands (Dai & Yang, 1991); New Ireland (Sendler, 1923); Australia - Port Denison; Solomon Islands - Bougainville Island (Takeda & Nunomura, 1976); Vanuatu - Santo (Takeda & Nunomura, 1976); New Caledonia; Samoa; Tahiti (Heller, 1865, Forest & Guinot, 1961).