(Balss, 1933)
Carapace slightly wider than long, bent obliquely downward at anterior 1/3 in front of gastric region; protogastric regions of both sides deeply separated from each other by a median longitudinal furrow, each being provided with two small tubercles, and branchial region with one, all being tipped with some stiff setae; cardiac region not convex, but rather prominent, with two low prominences. Antero-lateral margin sharply edged, shallowly cut into three angulated teeth. Chelipeds characteristic and basically same with those of the congeners; upper margin of merus sharply crested, angulated at subterminal part, with a deep cavity at distal part; outer lower margin of merus with three or four teeth; inner upper margin and distal margin of carpus crested; palm compressed, crested on upper margin, granulated on outer surface, with prominent longitudinal ridges of granules of good size; fingers leave a gape proximally. Anterior margins of ambulatory legs also crested. (Takeda, 1989)
Type locality: Ralum, New Britain.
Range: New Britain - Ralum (Balss, 1933a); Japan - Kakeroma-jima near Amami-Oshima (Takeda, 1989).