Ng, 1988
The carapace is only slightly convex anteriorly and covered with rather dense short pubescence of brush-like hairs and scattered long ones, some of the long hairs being disposed in rows and tufts; beneath the pubescence the surface is only slightly divided into regions and provided with minute granules near the antero-lateral borders. The front is somewhat produced, slightly rounded and bears a rather wide, deep median sinus; the triangular lateral lobule is distinctly separated from the frontal lobe and the supraorbital angle. The supraorbital border is minutely granulated and bears two shallow but distinct notches, while the infraorbital border bears a deep notch laterally and armed with several sharp granules, its inner angle being moderately prominent. The inner angle of the basal antennal segment is barely reached the ventral prolongation of the front; the antennal flagellum is about twice as long as the major diametre of the orbit and provided with scant longish hairs.
The antero-lateral border is armed with three spine-tipped teeth; the external orbital angle is not spine-tipped, but acute; those three teeth are nearly equal size, of the middle one is slightly prominent than the others. The subhepatic region is granulated. The postero-lateral border is nearly straight, much longer than the antero-lateral and only slightly convergent. The posterior border is slightly concave in the middle.
The chelipeds are unequal in both sexes; the entire outer surfaces of the carpus and smaller palm are covered with close-set pubescence mixed with longish ones; the outer obliquely-upper surface of the larger palm is also covered with pubescence, the remainder of the surface being quite smooth and glossy; beneath the pubescence those surfaces are provided with small conical granules and spiniform ones; those granules on the palm are beaded to some longitudinal series; the inner angle of the carpus is armed with a rather prominent spine-tipped tooth.
The ambulatory legs are very long and densely covered with brush-like hairs of various length; each merus of the first three pairs is armed usually with one to three spines on the upper border and with a very small terminal spine; the other segments are unarmed. (Takeda & Miyake, 1968a)
Type locality: Shika, Ishigaki-jima, Okinawa, Japan.
Range: Japan - Amami-Oshima (Takeda & Miyake, 1968a), Kamiyama-jima (Takeda & Miyake, 1968a), Ishigaki-jima (Takeda & Miyake, 1968a, Ng, 1988), Northern Daito-jima (Sakai, 1939, 1976); Palau (Takeda & Miyake, 1968a).