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Rathbun, 1914

Small species, the carapace is quadrangular and its dorsal surface slightly convex in both directions, covered with very fine granules but not with hairs (as described by Tesch). There is a rather distinct groove arising from the hepatic surface, passing obliquely backwards and continuous with the groove on lateral side of the mesogastric region; in full-grown specimens, however, these grooves are almost entirely obliterated. The front is nearly one-third as broad as the carapace, less deflexed and almost truncate. The antero-lateral borders are armed with three teeth, of which the first or the external orbital one is triangular, while the posterior two are spine-tipped. The postero-lateral borders are weakly convergent backward, the posterior border straight. The eyestalks are very thick and the cornea large and roundish. The inner orbital hiatus is large and partly filled by the basal antennal segment, which is considerably long.
Chelipeds are symmetrical, the arm has an acute spine near the distal end of the superior border; the twist has a stout tooth which is furnished with a few hairs at the inner angle, and a spinule at outer angle; the superior inner border of palm is moderately crested, the fingers are markedly curved inward at tip and are crossing. The ambulatory legs are extremely long and quite slender, the carpus, propodus, and dactylus are fringed with hairs along both borders. (T. Sakai, 1939: 566)

Type locality: Arafura Sea, 60-65 m.
Range: Japan - Yokosuka and Seto-naikai (Miers, 1886), Inubo-zaki, mouth of Tenryu-gawa, Maisaka, Suruga Bay, between Omae-zaki and Iro-zaki, Siono-misaki, Ashizuri-misaki, Bungo Strait, Sata-misaki, Satsuma, Koshiki-jima, and between Goto-retto and Cheju Do (Yokoya, 1933), Sagami Bay and Osaka Bay (Sakai, 1939), Sagami Bay, Kii Nagashima, Kii Minabe, and Osaka Bay (Sakai, 1976a), Tosa Bay (Muraoka, 1998); East China Sea (Takeda & Miyake, 1968c, 1972); Indonesia - Selat Madura (Tesch, 1918b); Arafura Sea (Miers, 1884a); 35-100 m.

Homoioplax haswelli