(Miers, 1886)
Carapace elongate triangular, armed with twenty erect and well-cut spinules, i.e., one on each supraocular eave, six on the gastric region, two of which are placed in the median line and two on either side of them; one each on cardiac, intestinal, and hepatic region and four on each branchial region, two of which are on the lateral margin.
The true rostrum is moderately prominent, the pseudorostral spines are straight, horizontal and divergent at an angle of about 45°. There is a large gap between the supraocular spine and the postocular cup, the latter being very broad and hollowed on the inner surface. The basal segment of antenna has a small terminal tooth at the antero-external angle; there is a small tubercle at the outer side of the green gland and a row of three or four tubercles on the pterygostomial region. The merus of the external maxillipeds is extremely produced at the antero-external angle.
Chelipeds of female are very slender, but in the male they are far stouter than the ambulatory legs; arm has a small terminal spine on the upper border, wrist is cristate on the inner and outer borders and its upper border also obtusely cristate; palm laterally compressed and the upper and lower edges obtusely cristate. Merus of the ambulatory legs is armed with a small terminal spine on the upper border.
Abdomen of both sexes consists of seven distinct segments. (Sakai, 1938: 278)
Type locality: Philippines, 9°26'N, 123°45'E, "Challenger" stn 210, 680 m.
Range: Seychelles (Rathbun, 1911); Saya de Malha Bank (Rathbun, 1911); Andaman Sea (Alcock, 1895a); Australia - North-West Shelf (Griffin & Tranter, 1986b); Japan - Gobo and Tosa Bay (Sakai, 1938a, 1976), Shiono-misaki (Takeda, 1979a), Ashizuri-misaki (Miyake, 1983); East China Sea (Takeda, 1975a); Philippines - (Miers, 1886), Mindoro, Marinduque Island, north Samar, Siquijor and north Mindanao (Griffin, 1976), north of Lubang Island and Verde Island Passage (Serène & Vadon, 1981); Indonesia - Bali and Kepulauan Kai (Griffin & Tranter, 1986a); 70-680 m.