Sakai, 1961
The nearest relative of this new species is Randallia granulata Miers (1886) from Tongatabu and Fiji, the type of which is in the British Museum and was compared with the present species. The general aspect of the animal is just like that of R. granulata but the carapace of the new species is a little narrower than long and the postero-lateral borders are convergent instead of being swollen as in R. granulata. The dorsal surface is thickly covered with studded granules, of which those on the middle portion are small and those on the marginal surface are somewhat larger. There is an indistinct or vestigial groove on either side of the gastric and cardiac regions and a more indistinct, transverse one between the gastric and cardiac regions.
The front is narrow, thick and bilobed, its anterior border thickly covered with flat granules. There are no distinct tubercles on the subhepatic and lateral borders; a pair of laminar processes are present, one on either side of the narrow posterior border. The external maxilliped has the ischium, merus, and exognath thickly granulated, but the inner half of the ischium is smooth and glabrous.
The merus, carpus and propodus of the chelipeds are subcylindrical and are thickly covered with studded granules as on the carapace, but the granules on the under surface are very small. The prehensile edges of the fingers are thin, not gaping, and are finely deticulated, six or seven denticles being of good size and sharp. The ambulatory legs are very slender; the merus, carpus and propodus are microscopically granulated. The dactylus of each pair is thickly hirsute on the anterior border.
The abdomen is just like that of Randallia pustuloides but the process near the end of the R-segment is smaller. (Sakai, 1961)
Type locality: Tosa Bay, Japan.
Range: Japan - off Kumano-nada and Tosa Bay (Sakai, 1961, 1976), Kii Minabe (Sakai, 1976a); 50-85 m.