Takeda, 1977
Carapace triangular as a whole, with a strong lateral and dorsal postorbital constriction; regions distinctly demarcated and elevated, but not cariniform, being scantly covered with blunt conical or flattish granules; main granules rather symmetrically disposed and tipped with some short curled hairs. Gastric region high, and at its posterior or median part there is a blunt conical granule which is directed obliquely backward, but not tuberculated at all. Cardiac region conical as a whole and deeply separated from gastric region by a wide depression and from inner branchial regions of both sides and intestinal region by shallow furrow, being tipped with a high tubercle which is also directed obliquely backward; a conical granule at its posterior slope in median line. Intestinal region with some granules small, not convex, but distinct. Branchial region convex along antero-lateral border of carapace, and more or less cariniform near its postero-lateral angle; inner branchial region demarcated between cardiac and true branchial regions, but not convex; a deep longitudinal cavity in front of inner branchial region and just outside of depression between gastric and cardiac regions. A similar deep cavity between orbits of both sides.
Front strongly deflexed, its free edge trilobate, but the laterals almost indistinguishable. Hepatic region separated from orbit by a deep bight, and weakly convex dorsally, its margin being generally convex, irregular and narrowly thin-edged; its posterior end overlapping antero-lateral margin of carapace, but interruption between hepatic and antero-lateral margins very distinct. Antero-lateral margin thin-edged and composed of four overlapped lobes, free edges of which are truncated and irregular; middle two lobes smaller. Postero-lateral angle stout and slightly upcurved, being armed with two outer and one inner depressed tubercles. Postero-lateral border of carapace concave and occupied by three teeth, median one of which is very prominent. True posterior margin of carapace protruded posteriorly much beyond postero-lateral angle; its summit obtuse, but distinguished from lateral margins.
Peduncle of antennule with a spinule near its median part of exposed surface. Antennal segments characteristically tuberculated as figured. Third maxilliped studded with tubercles; some on ischium along outer border, one near postero-lateral corner of merus and two on outer border of exopod larger than the others.
Chelipeds quite unequal in holotype female, the left being the larger. Merus triangular in cross section, with thin edges; anterior upper edge with three large teeth and some smaller ones, and posterior edge irregularly and sharply dentate; in smaller merus terminal tooth on posterior border high and rounded at its apex to be lobate. In smaller carpus a conical tubercle at inner part of outer surface, while in larger carpus a low mound at this place. In smaller palm a thin lobe at proximal part of upper border, a similar but sharper one at distal two-thirds of upper border, a spiniform tubercle at middle of inner part of upper border, a similar tubercle on inner surface obliquely in front of a tubercle just mentioned, two conical tubercles on distal part of outer surface; lower border sharp, serrated with six conical laciniated teeth; in larger palm tubercles seen in smaller one indicated by low tubercles or granulated prominences; a lobe at proximal part of upper border strongly curved outward.
All of ambulatory legs detached in holotype female. First two pairs slender and similar to each other; anterior border of merus sharp, with four or five indistinct teeth, and posterior upper and lower borders also each with three small conical teeth; in second pair propodus a small tubercle on anterior border and three on posterior border. Third pair stouter, but shorter than preceeding pairs; three high teeth or lobes on posterior upper border of merus; anterior border of carpus with a thin lobe; in propodus a similar lobe also at middle of anterior border and three tubercles on posterior border. In last pair two large lobes on posterior upper border of merus, a large thin lobe each on anterior and posterior borders of carpus, a thin lobe at middle of anterior border of propodus and three high lobes on posterior border of propodus. In all pairs dactyli with tomenta on distal two-thirds, not tapering. (Takeda, 1977b)
Type locality: Mage-jima, Kagoshima Prefecture, Japan, 20-40 m.
Range: Japan - Mage-jima, Kagoshima Prefecture (Takeda, 1977b); 20-40 m.