Sakai, 1961
Very near to Parilia alcocki Wood-Mason (1891) from the Indian waters, of which a syntype in the British Museum was compared with the present species.
The carapace is quite circular in outline, the length and breadth being almost equal and its dorsal surface markedly convex and covered with minute granules. The regions are almost indistinct but the cardiac and intestinal regions are very faintly defined on either side by a shallow and indistinct groove, and the intestinal region is somewhat convex posteriorly.
The front is very narrow and sharply bidentate. The lateral border is marked with a tubercle at the junction of the antero-lateral and postero-lateral borders and a rudimentary one just in front of it. The postero-lateral border is also marked with a tubercle near the posterior border. There are two rather salient processes, one on either side of the narrow and deflexed posterior border, and a long, upcurved spine on the intestinal region just above the centre of the posterior margin.
The hepatic region is, contrary to that of P. alcocki, not at all inflated, the epistome also does not project much beyond the edge of the front. The exognath of the external maxillipeds is not so broad as in that species, and its distal portion is rather narrow and oblique posteriorly, not forming a typical foliaceous expansion as in that species.
Chelipeds of the male are about 2.9 times as long as the carapace; merus, carpus and propodus are smooth to the naked eye but are uniformly granulated when seen under a lens. The distal portion of the propodus is somewhat compressed, both fingers are also compressed and are uniformly denticulated on the cutting edge. The merus, carpus and propodus of the ambulatory legs are cylindrical, smooth and rather glabrous to the naked eye; the dactylus is fringed with brownish hairs on the anterior and posterior borders. (Sakai, 1961)
Type locality: Tosa Bay, Japan.
Range: Japan - Tosa Bay (Sakai, 1961, 1976); Taiwan; Philippines - Verde Island Passage (Serène & Vadon, 1981), Verde Island Passage, south of Tayabas Bay, west of Semirara Islands, north of Panay, west of Leyte and east of Cebu (Chen H., 1989); 100-425 m.