Sakai, 1961
The carapace is rhomboidal in outline, the length and breadth being subequal and the lateral angle of the carapace is well projecting sideways. The dorsal surface is markedly convex and the regions are well defined by rather deep and narrow grooves. The gastric region is elongate and rhomboidal in outline, its extreme breadth just one-third the breadth of the carapace; some of the tubercles found on this region are of good size and are flat and confluent. The intestinal region is well defined, convex, covered with studded tubercles, one tubercle at the summit of this region is sharp but is not prominent. In Randallia pustulosa Wood-Mason, which may be the nearest kin of this species, the tubercles are not so distinct and a very long spine is situated at the convex portion of the intestinal region, and is posteriorly projecting, its apex curved upwards. Some of the tubercles on the hepatic and branchial regions are also flat and confluent and of good size.
The front is very narrow and bidentate, the median sinus very shallow. The subhepatic ridge is armed with a submedian tubercle which is followed by one or two small tubercles.
The antero-lateral border belonging to the branchial region is armed with about four studded tubercles posterior to the hepatic border. The teeth at the junction of antero-lateral and postero-lateral borders are large and salient and projecting sideways. The postero-lateral border is armed with eight or ten tubercles, the anterior two or three of which are salient as those of the lateral angle, the others are round and high. The posterior border is narrow but is broader than the front, and is thickly covered with tubercles of which one on either side is high and prominent. The under surface of the subhepatic region is also covered with studded tubercles.
The chelipeds are stouter than those of Randallia pustulosa, the merus is rather prismatic, covered with studded small granules, of which those on the anterior and posterior borders are rather high; in the carpus and propodus, the tubercles are small but those on the outer border of the propodus are high. The movable and immovable fingers are compressed and their outer borders are sharply carinate. In the anterior three pairs of ambulatory legs, the merus is smooth but its upper border is furnished with small granules, the carpus bears longitudinal rows of studded tubercles; the propodus is irregularly armed with high tubercles along the upper border. In the last ambulatory legs, the arm is provided with high tubercles on the upper surface and the posterior border; the carpus and propodus are irregularly studded with high tubercles on their upper surface.
The spinule near the distal surface of the R-segment of the male abdomen is high and acuminate. (Sakai, 1961)
Type locality: Tosa Bay, Japan.
Range: Japan - off Kumano-nada and Tosa Bay (Sakai, 1961, 1976), Kumano-nada (Miyake, 1983), Suruga Bay (Takeda, 1997); Taiwan; Philippines - north of Lubang (Chen H., 1989); 85-192 m.