(Alcock, 1898)
With the exception of crosnieri in which the teeth are not well differentiated, the antero-lateral margins of the carapace have three or four teeth behind the exorbital angle, the two posterior are generally more projecting and more angular. The carapace width is greater than 1.30 times the length. The carapace has the regions 2M and 3M incompletely or not at all separated from each other and from the cardio-intestinal region; all the regions are smooth (sometimes feebly tuberculate near their margins). The submedian lobes of the frontal margin are hardly in advance of the lateral and separated by an open fissure. The posterior tooth of the antero-lateral margins of the carapace is slightly less stronger than the preceeding one. The chelipeds have a triangular, blunt tubercle on the internal angle of the carpus. The ambulatory legs are hardly flattened (subcylindrical) with the superior margin without a smooth crest, but with some conspicuous teeth on the merus and some rugose elevations on the carpus and propodus. The first pleopod of the male is unknown. (Serène, 1984)
Type locality: Sri Lanka.
Range: India - Bombay (Chhapgar, 1957); Sri Lanka (Alcock, 1898); Malacca Strait - Pulau Angsa (Balss, 1938b, Guinot, 1979b); Japan - Kii Nagashima, Kii Minabe, and Kii Shimogusui (Sakai, 1976a); China - Guangdong (Dai & Yang, 1991).