(Fize & Serène, 1955b)
Carapace moderately depressed, subquadrangular, anterior part almost completely divided into two large concave, smooth parts and smooth regions reaching to anterior and lateral borders of carapace, posterior borders of concavities subparallel to posterior border of carapace, spinulated and hairy, L-shaped and provided with a long median longitudinal ridge, reaching as far as front, posterior surface of carapace covered with minute granules and sparse short hairs; front shallowly concave and fringed with spinules and setae, a low median projection present; inner orbital angle rounded and topped by a spine; antero-lateral borders with external orbital angle similar to internal one, but reaching beyond its level. Chelipeds homochelous, slender. (Türkay 1995)
Type locality: Nha Trang, Vietnam.
Range: Japan - Kushimoto, Wakayama Prefecture (Takeda & Tamura, 1983), Shiono-misaki (Miyake, 1983), Hachijo-jima (Takeda & Tamura, 1985); Vietnam - Nha Trang (Fize & Serène, 1955b, 1957).