Miyake & Takeda, 1967
Carapace elliptical, gently convex in both directions, glabrous, with ill-defined surface. Fronto-orbital breadth more than 2/3 as wide as carapace. Antero-lateral border arched, with a broad lobe, a sharp curved spine and a small triangular tooth. Chelipeds moderately heavy, unequal; merus standing out more than 2/3 from outline of carapace, with an obtuse tooth at proximal part of upper margin; carpus bears a prominent obtuse protuberance at its inner angle; palm and fingers very smooth, without any traces of tubercles or granules. Ambulatory legs slender and sparsely covered with long hairs, armed with a row of spines on each segment; dactyli strongly biunguiculate. First male pleopod bears numbers of stout, somewhat undulate setae on its subterminal part. (Takeda, 1988)
Description of holotype: Carapace wide, gently convex in both directions, glabrous and ill-defined. The fronto-orbital breadth occupies more than two-thirds of the carapace. The front doubly rimmed with a small sinus, and with less prominent lateral lobules distinctly separated from the supraorbital border.
The antero-lateral border shows a broad, rounded lobe, of which the anterior part separated from the external orbital angle by a shallow bight, and the posterior margin granulated somewhat at the lower level. Following this lobe the antero-lateral border ends in a large, sharp tooth and a minute one; the anterior sharp spine curved forwards and the posterior tooth less prominent. The postero-lateral border gently convergent, and the posterior border slightly concave in the middle.
The infraorbital border bears one distinct notch near the external orbital angle. The hiatus between the inner angles of both the supra- and infraorbital borders rather broadly opened. The basal antennal segment thickly fills the orbital hiatus, its inner angle broadly touched with the prolongation of the front, while its outer angle fails to reach to the level of the inner infraorbital angle.
In the merus of the third maxilliped the antero-outer angle produced in some extent and the antero-inner angle not so strongly concave but truncate.
Cheliped in the right side slender. Merus granulated, standing out more than two-thirds from the carapace; the upper border bears the obtuse tooth on the proximal part. Carpus bears one prominent obtuse protuberance at the inner angle. Palm and fingers very smooth without any traces of the tubercles or granules; fingers hollow in hoof-form at the tips. Cheliped in the left side missing.
Ambulatory legs slender and sparsely covered with long hairs; the upper border of each segment armed with a row of spines. Dactylus strongly biunguiculate. The male abdomen fused in the 3-5 segments. The first male pleopod bearing numbers of stout, somewhat wavy setae on its subterminal part. (Miyake & Takeda, 1967: 295)
Type locality: Shika, Ishigaki-jima, Yaeyama-retto, Okinawa, Japan.
Range: Japan - Ishigaki-jima (Miyake & Takeda, 1967).