Takeda & Miyake, 1970
Description of holotype: The carapace is rather narrow and very strongly convex antero-posteriorly; the dorsal surface is markedly sculptured into areolae which are convex and studded with conical granules of good size; those granules are not always equal, and those on the antero-lateral areolae are very prominent; each of the granules is fringed with one to three setae; each areola is usually provided with one or two long brush-like hairs. The front is truncated and cut into two lobes by a median deep, V-shaped sinus; each of the lateral lobules is triangular and weakly directed outwards, but not advanced beyond the free margin of the frontal lobe, being separated deeply from the frontal lobe by a U-shaped notch. The supraorbital angle is so produced laterally that the inner part of the supraorbital border is lobular and overhangs the orbit; the inner infraorbital angle is also produced into a rounded lobe, so that only a narrow hiatus is left between both angles; the supraorbital border bears two small notches; the external orbital angle is strongly produced into an acute tooth, so that the outer part of the lateral notch is directed obliquely forwards as the inner border of the external orbital angle. The outer angle of the antennal basal segment is somewhat prolonged into the orbital hiatus, but as mentioned before, the hiatus is so narrow and rather long that the prolonged outer angle is by far not reached the distal part of the hiatus.
The antero-lateral border of the carapace is armed with three spiniform teeth behind the acute external orbital angle; those teeth are directed and very slightly curved obliquely forwards and weakly upwards; of those the second is the most prominent, but the distance between the last teeth of both sides is the longest, being the greatest breadth of the carapace. The subhepatic region is ornamented with granules of good size, some of which are visible between the external orbital tooth and the first and second antero-lateral teeth. The postero-lateral border is rather weakly convergent.
The chelipeds are distinctly unequal, the right being the larger. In the larger merus just behind the subterminal interruption of the upper border is a prominent lamellar tooth that is tipped with a spiniform granule; in the smaller merus it is less prominent and the terminal spine is also much smaller than that of the larger merus. The outer surface of the carpus is armed with scattered conical granules interspaced with short setae; among the setae some long brush-like hairs are implanted near the outer and the distal parts; its inner angle is tuberculated with a conical granule at the tip, being directed somewhat upwards. The palms of both chelae are quite unequal, and covered with large conical granules and with short setae and long brush-like hairs; the granules and hairs are, however, more accentuated on the smaller palm; two spines on the upper border of the smaller palm are distinctly spiniform and curved forwards.
Ambulatory legs are comparatively long and stout, being covered with short setae and long brush-like hairs. Each merus is armed with a terminal spine; in the first three pairs each of the spines is slender and weakly curved, while that of the last leg is the shortest; the upper border of each merus bears no prominent granules, but the lower border is granulated; in addition, the upper surface of the last merus is granulated near the lower border. Each of the carpus is ornamented with a longitudinal shallow cavity that is devoid of hairs. The abdomen and the pleopods are not fully developed. (Takeda & Miyake, 1970b)
Type locality: Ishigaki-jima, Okinawa, Japan.
Range: Japan - Ishigaki-jima (Takeda & Miyake, 1970b); Palau (Takeda & Miyake, 1970b).