(Herbst, 1803)
Carapace behind the orbital region is subquadrate, only slightly broadened posteriorly; the regions are fairly well defined, the hepatic regions being markedly depressed. There are two spines, one behind the other, in the median line of the gastric region. The cardiac region armed with two small spines side by side. The true rostral spine ill-developed; the pseudorostral spines are deflexed downwards at an angle of about 45°, they are fused at the base and divergent at the tip, where they project outwards. A prominent erect spine in the middle of the supraocular eave and a short spine at the posterior angle of the latter but with no preocular spine. Intercalated spine moderately prominent, the postocular spine most prominent with its base broad. Behind the postocular spine are about nine upcurved spines, three of which belong to the hepatic margin and the others to the branchial. In the centre of the mesobranchial region, in almost transverse line with the cardiac spines, is a high dorsal branchial spine. The basal segment of antenna is very broad and laterally dilated, with an antero-external tooth and a small one behind it.
Chelipeds of male are covered with fine granules; the ischium is ventrally convex, the arm is cylindrical and curved, with a distal and a subdistal tooth on the upper border; palm is not much swollen; fingers meet only near the distal end, the cutting edges being finely and uniformly denticulated. The granulation of the chelipeds is not remarkable in the case of the female. The ambulatory legs rapidly decrease in length from 1st to last, the merus is armed with a distal spine on the upper border; the carpus is broadened and longitudinally channelled. All these segments are very densely covered with hairs, especially on anterior and posterior borders. (Sakai, 1938: 313)
Type locality: East Indies.
Range: Red Sea - Gulf of Suez (Griffin & Tranter, 1974); Somalia - off Cape Guardafui (Griffin, 1974); Mozambique - Delagoa Bay (Barnard, 1950); South Africa - (Stebbing, 1905), Natal (Krauss, 1884); Madagascar - Nosy Bé (Griffin, 1974); Providence Island (Miers, 1884b); Mauritius (Michel, 1964); Pakistan - Karachi (Tirmizi & Kazmi, 1991); India - Orissa and Malabar (Alcock, 1895a); Sri Lanka - Trincomalee (Griffin & Tranter, 1986a); Burma (Alcock, 1895a); Mergui Archipelago (Alcock, 1895a); Japan - (de Haan, 1837), Tokyo Bay (Ortmann, 1893), Nagasaki (Alcock, 1895a), between Ito and Hatsushima (Sakai, 1935), Tateyama Bay, between Ito and Hatsushima, Shimoda, Nanki Shirahama and Nagasaki (Sakai, 1938a), Sagami Bay (Sakai, 1965b), Tokyo Bay, Sagami Bay, Mikawa Bay, Wagu, Kii Nagashima, Kii Minabe, Tosa Bay, and Nagasaki (Sakai, 1976a), Amakusa (Yamaguchi et al., 1976), Yamagata Prefecture (Suzuki S., 1979), Nagasaki (Griffin & Tranter, 1986a), off Matsuyama, Seto Inland Sea (Takeda et al., 2000); Korea - Pusan (Kim, 1970, 1973), Cheju-do (Kim & Chang, 1985); China - Hong Kong (Alcock, 1895a); Gulf of Thailand - between Koh Kut and Koh Kahdat, and Koh Sakait (Griffin & Tranter, 1986a); Sulu Archipelago - Marongas (Griffin & Tranter, 1986a); Indonesia - Java Sea, Seram Sea, Ujung Pandang and Kepulauan Aru (Griffin & Tranter, 1986a); Australia - eastern and northern Australia (Griffin, 1966c), Moreton Bay (Campbell & Stephenson, 1970); 2-100 m.