Sakai, 1963
The carapace of this new species is subglobose in outline, beset with sixteen conical protuberances; the dorsal surface is thickly covered with fine and coarse granules, of which some on the lateral borders or near the foot of the protuberances are high, and mushroom-like in appearance.
The characteristic sixteen conical protuberances are as follows: two side by side on the protogastric region and projecting upward and forward, their apices approaching each other; two in the median line, i.e. one each on cardiac and intestinal region, the former projecting upward and the latter backward; on the lateral border, one hepatic and two anterior branchial, which are situated at a lower level; then three lateral branchial ones, which are at a hither level, the anterior one projecting obliquely forward, the posterior one obliquely backward, and the middle one located at the antero-lateral angle, at a slightly lower level.
The front is narrow, its anterior border is obscurely bilobed; the posterior border is much broader than the front, marked with a low obscure protuberance at either postero-lateral angle.
Chelipeds are lacking. The ambulatory legs are very slender, the merus, carpus and propodus are subcylindrical, each being thickly covered with flat granules of microscopic size; the dactylus is almost as long as the propodus, slightly curved inward.
Measurements: Female holotype, length of carapace 5.5 mm, width of same 6.0 mm. (T. Sakai, 1963)
Type locality: off Mimase, Tosa Bay, Japan, 100 m.
Range: Japan - Tosa Bay (Sakai, 1963, 1976); East China Sea (Takeda & Miyake, 1972c).