(Zehntner, 1894)
The carapace is transversely oval and densely and uniformly covered with a fur without long hairs together with adherent inorganic matter, being fairly convex fore and aft; on the removal of them the dorsal surface is very smooth and ill-defined only with the weakly raised mesogastric and cardiac regions.
The front is slightly less than the length of the carapace, almost truncated and bears a median, small but distinct notch; the lateral angle of each lobe is not produced at all, but only roughened, being confluent with the supraorbital border. The orbit is rather small, and its major diametre is equal in length to each frontal lobe; the eyestalk with a fur is stout, entirely fills the orbit and rather protruded forwards beyond the general contour of the carapace, but movable; the supraorbital border is hardly raised along its inner part, and in the dorsal view deeply concave at its inner part and then rather directed forwards towards the blunt external orbital angle; the infraorbital border is transverse and almost entire only with two ventral depression below the external orbital angle and in the middle; its inner angle is not prominent and is touched with the very short ventral prolongation of the front. The antennal flagellum slightly exceeds twice the length of the major diametre of the orbit. The third maxillipeds, pterygostomial and subhepatic regions are hairy like the dorsal surface of the carapace, but the ischium is rather sparsely covered with a fur; the merus is quadrate with the antero-external angle rather angulated.
The antero-lateral border of the carapace is arched, more or less ridge-like with indistinct granules, being interrupted by three notches; in the smaller specimens the last two lobes are rather tooth-like with the deepish notches, but in the larger ones the notches are shallow and those lobes are only convex together with the first two. The postero-lateral border is moderately or rather weakly convergent.
The chelipeds are large and unequal in both sexes. The merus is short, while the carpus is prominent, both being densely covered with a fur like the carapace; the inner angle of the carpus is tuberculated. In both chelae of the female and the smaller chela of the male the entire surface of the palm is covered densely with a fur and sparsely with longish hairs, and on the removal of them covered with sparse minute granules; in the larger palm of the male the outer lower surface from the proximal part of the lower border to the base of the movable finger is devoid of a fur and glabrous. The fingers are also hairy nearly towards the tips in the smaller chela, and on the proximal parts in the larger chela; in the smaller chela the upper border of the movable finger is nearly straight or rather concave; the colour is almost restricted to the distal halves and extended back to the proximal parts along the cutting edges.
The ambulatory legs are slender and densely haired like the carapace and chelipeds, being sparsely fringed with long feathered and simple hairs. The dactylus of the last pair is weakly curved dorsally near the terminal small claw. (Takeda, 1972c)
Type locality: Ambon, Indonesia.
Range: Japan - Ryukyu-shoto (Takeda, 1972c); Indonesia - Ambon (Zehntner, 1894).