(Lamarck, 1818)
The carapace is transverse and rather depressed; the dorsal surface is well separated into regions by deep furrows and shining without hairs and granules; 1M is not separated from 2M which is also very indistinctly isolated from 3M; the cardiac region (1P) is very prominent; the submedian longitudinal furrows outside of 2M, 3M and 1P, and a transverse furrow in front of 2P are remarkably deep; 1L is not demarcated, while the areola which may represent 2 and 3L is prominent; 4L is nearly transverse and confluent with the third antero-lateral tooth; 5L is very prominent but shallowly separated from 6L by an oblique furrow; 1L is confluent with the fourth antero-lateral tooth, being imperfectly separated from 5L by a longitudinal shallow furrow; the postero-lateral and posterior surfaces of the carapace is somewhat eroded. The front is composed of two convex lobes that are rather strongly turned downwards; each of the lobes is deeply separated from the supraorbital angle and the ventral prolongation of the front; two supraorbital and one infraorbital notches are entirely closed but distinct; the inner infraorbital angle is tubercular with rounded summit. (Takeda, 1972a)
Type locality: Mauritius.
Range: Mozambique - Delagoa Bay (Barnard, 1950); South Africa - Umkomaas (Stebbing, 1921a); Ile Europa (Serène, 1984); Mayotte Islands (Serène, 1984); Madagascar - Nosy Bé, Nosy Iranja and Nosy Karakagoro (Serène, 1984); Seychelles (Rathbun, 1911); Mauritius (Alcock, 1898, Bouvier, 1915b, Michel, 1964); Andaman Islands (Alcock, 1898); Mergui Archipelago (Alcock, 1898); Japan - Yoron-jima and Okinawa-jima (Sakai, 1976a), Kamiyama-jima, Okinawa (Takeda, 1972a); Taiwan; China - Paracel Islands (Dai & Yang, 1991); Singapore; Australia - Great Barrier Reef (Ward, 1942b); New Caledonia.