Rathbun, 1906
Carapace hexagonal, a little broader than long; elevated portions finely granulate, depressions smooth. Three gastric elevations corresponding to the regional subdivisions; a transverse curved fold or elevation running across the cardiac and part way across the branchial region; smaller and lower nodules on the anterior branchial and hepatic areas.
Front slightly deflexed, truncate, divided into two feebly concave and oblique lobes by a small notch, and separated by a faint groove from the inconspicuous orbital angle; edge double, granulate. Two teeth of moderate size at lateral angle; at posterior base of the last one a much smaller tooth; a notch at middle of postero-lateral margin which is thick and coarsely granulate. A single line of granules on posterior margin.
Endostome with longitudinal ridges. Inflected portion of carapace and margin of maxilliped furnished with club-shaped setae.
Only one cheliped, the right, present, shorter and more cancroid than in other species; length about one and a half times that of carapace; surface granular; a broad tooth on upper and lower margins of arm near distal end; a triangular tooth at inner angle of wrist, outer face rough. Palm as high as its superior length, ridged longitudinally inside and out, there being four ridges outside, between upper and lower margins. Fingers stout, grooved, fitting close together.
Legs compressed, with sharp, cristiform borders; two teeth on upper border of carpal, one on same border of propodal joints; last three joints hairy below. (Rathbun, 1906)
Type locality: Kauai Island, Hawaii.
Range: Japan - Shima Peninsula (Sakai, 1976a), Ogasawara-shoto (Takeda, 1973a); Hawaiian Islands - Kauai (Rathbun, 1906), Oahu.