Rathbun, 1906
The carapace rounded triangular in outline, very slightly longer than wide, the dorsal surface, like the entire surface of the chelipeds, mostly covered with mushroom-like tubercles of various sizes. Between gastric and cardiac regions, the intermediate surface is hollowed and not tuberculated, whence a deep groove extends obliquely forwards to the hepatic region and also backwards to the side of the intestinal region. There are three somewhat high conical processes, which are covered with mushroom-like granules, in the median line of the carapace, one, the largest of all, is placed on the gastric region and the others on the cardiac region. There are also two similar processes on the postero-lateral borders, the anterior is larger than the other which is small and deviates to the dorsal surface of the branchial region. The hepatic region produced into a lobe, which is covered with granules, the antero-lateral margin anteriorly armed with a row of about 5 or 6 large mushroom-like tubercles and posteriorly with 6 granulated teeth.
The rostrum produced and divided obscurely into three lobes, its dorsal surface depressed. The supraocular eave and the postocular tooth are covered with the said tubercles; the surface between the orbital margin and the hepatic region is hollowed.
The chelipeds of our two specimens are unequal in size; the merus has 2 or 3 spines on the dorsal surface, 14 to 16 teeth of unequal sizes on the anterior border and 3 or 4 large teeth on the posterior border; wrist has 1 or 2 teeth on the outer border; the palm has 4 or 5 large and 5 or 7 smaller teeth on the outer border, 3 or 4 large and 7 or 8 smaller teeth on the inner border. The tip of fingers distally acuminate. The ambulatory legs are very slender and compressed, merus of all pairs, and carpus and propodus of the last pair, are armed with a row of tubercles on both anterior and posterior borders; propodus and dactylus are covered with tomentum. (Sakai, 1938: 332)
Type locality: north-east coast of Hawaii, Hawaiian Islands.
Range: Japan - between Ito and Hatsushima (Sakai, 1935, 1938), Sagami Bay (Sakai, 1965b), Sagami Bay and Tosa Bay (Sakai, 1976a), Shiono-misaki (Takeda, 1979a); Hawaiian Islands - Oahu, Molokai, Kauai, Hawaii, Aleunihana Channel, and Modu Manu (Rathbun, 1906); 70-95 m.