Calman, 1909
Carapace oval and strongly convex fore and aft; the surface polished and ill-defined except for a shallow median furrow and a pair of the crescent depressions parallel to the supraorbital borders. The front almost straight with a shallow median sinus and without the lateral lobules separated from the inner supraorbital angle by the shallow incision. The antero-lateral border thick and arched with scarce traces of the three lobes. The inner angle of the basal antennal segment just touched with the ventral prolongation of the front, while its outer angle just parallel to the inner infraorbital angle.
Chelipeds massive, quite unequal in both sexes; palm of the larger cheliped rough with the granules arranged somewhat in rows on the outer surface, and the palm of the smaller one slender and also rough, but not so strong as in the large one. Both the movable and the immovable fingers of the larger cheliped toothed along the cutting edges bearing a good deal of hairs on the inner proximal parts, their tips not excavated, while those of the smaller one provided with sparse hairs along the prehensile edges, their tips excavated and denticulate. (Miyake & Takeda, 1967: 293)
Type locality: Christmas Island, Indian Ocean.
Range: Christmas Island (Calman, 1909, Serène, 1984); Japan - Amami-Oshima (Miyake & Takeda, 1967); Kiribati.