(Balss, 1935)
Carapace transversely ovate and evenly convex longitudinally; its dorsal surface well divided into regions by wide but shallow, smooth furrows, being covered with tufts of long, soft brush-like hairs; each frontal region small, but convex anteriorly with some conical granules and a tuft of long hairs; both frontal regions side by side traversed by an interconnecting row of short hairs; a small region with some granules and a tuft of two or three hairs demarcated behind inner part of frontal region; protogastric region large with conical granules of good size, being provided with a prominent tuft of long, soft brush-like hairs and some scattered shorter ones; median gastric region subdivided into three, its anterior one being not prominent only with some small granules; each of its posterior subregions convex with several conical granules and some longish hairs; hepatic region produced into a high lamellar lobe with conical granules, ending in a blunt tip; a large region behind this hepatic lobe convex with conical granules and prominent tuft of hairs; a region between this and posterior subregion of median gastric region bears also a small tuft of hairs, being provided with conical granules mainly on its outer half; cardiac region indistinctly subdivided into two, each with a cluster of granules and a tuft of hairs; postero-lateral dorsal surface wholly covered with conical and round granules of good size; a round cluster of granules just in front of lateral angle of posterior border.
Front well developed and most strongly produced just near its median V-shaped notch; each lobe obliquely truncated in dorsal ciew, but in reality its free margin fairly concave; incision between frontal lateral and supraorbital angles markedly deep, so lateral end of frontal lobe almost longitudinal. Supraorbital border thin with two deep notches and marginal granules; supraorbital angle fairly strong and directed obliquely forward, but not tuberculated; external orbital angle strongly developed as a thin lobular tooth similar to antero-lateral teeth, its dorsal surface being concave and outer border convex to be rounded; infraorbital border bears two very deep interruptions; a lobe thus formed between two interruptions round at tips, but inner infraorbital angle much more strongly protruded forward with an acute tip and ventrally convex; this inner angle really strong so as to be for its most part visible in dorsal view. Antero-lateral border with three strong teeth behind lobular external orbital angle, three incisions being markedly deep and wide; first and second teeth nearly equal and their outer borders convex with conical granules; last tooth round at its tip, slightly smaller than preceedings, but stout and more or less tubercular. Postero-lateral border rather concave. A transverse row of pearly granules in front of true posterior border.
Chelipeds unequal and slightly differ in shape of palms; merus small and not exerted from antero-lateral teeth of carapace; upper border with a series of some pearly granules and a strong subterminal tooth; outer surface of carpus with several tubercles formed by conical granules, its inner angle being armed with a similar tubercle; palm also with several tubercles on and along its upper border; in smaller palm those on its upper border compressed to be thin lobes with acute tips, being directed fairly inward, so not visible in outer view; outer surface of palm with sparse hairs and conical granules of various size, larger ones being of good size arranged to form about three longitudinal rows; in larger palm lower one third of outer surface almost devoid of hairs and granules; both fingers of larger chela stout with molar-like teeth, while those of smaller chela proportionally longer, sharply and irregularly toothed, and movable finger with conical granules along proximal one third of upper border.
Ambulatory legs rather short with fringes of brush-like hairs; anterior border of merus irregularly roughened by a series of conical granules directed distally, subdistal interruption being deep; carpus about half of merus, being armed with a belt of conical, of high truncated granules on its anterior border and a longitudinal row of similar granules on its upper surface; propodus as long as, or very slightly longer than carpus, being covered with a thick tomentum on its distal half; a small cluster of conical granules at middle portion of its anterior border; dactylus with a similar tomentum and longish hairs of various length. Male abdomen with seven segments remarkably narrow. Male first pleopod with some very long, strong horny setae. (Takeda, 1974a: 216)
Type locality: Pamban, Gulf of Mannar.
Range: India - Gulf of Mannar and Madras (Balss, 1935a); Singapore (Serène & Umali, 1972); Japan - Itoshima, Fukuoka Prefecture (Takeda, 1974a).