Shy & Ng, 1998
Carapace smooth, moderately convex transversely and longitudinally. Frontal regions faintly divided into 2 lobes; supraorbital crista smooth to almost smooth, sometimes lined with very low granules; infraorbital crista lined with small but distinct granules. External orbital angle stout. Antero-lateral crista distinct, lined with small granules; epibranchial tooth small, faintly discernible. Postorbital crista rough, with striae. Frontal, orbital, branchial and metabranchial regions covered with weak striae; gastric, cardiac and intestinal regions smooth. Antero-lateral margin cristate, uneven. Cervical groove faint; H-shaped median gastro-cardiac depression distinct. Distance between tip of closed male abdomen and anterior margin of thoracic sternite 4 about 1.6 times length of thoracic sternites 1-3. Right chela larger than left; external margin of palm smooth; fingers of right chela forming ovate gape when closed. Ambulatory legs of normal length; total length of second leg about 2.0 times carapace length; length of merus about 4.2 times maximum width. Telson of male abdomen bell-shaped; segment 6 squarish. G1 with subterminal segment moderately curving outwards, outer proximal margin with tooth, inner proximal margin moderately dilated; terminal segment straight, distal one-third slender, with spinules and setae; length of synovial membrane about 3.2 times maximum width. G2 with outer proximal margin of basal segment dilated; distal segment short, about 0.1 times total length. (Shy & Ng, 1998)
Type locality: Uotsuri-jima, Senkaku-shoto, Okinawa, Japan.
Range: Japan - Uotsuri-jima, Senkaku-shoto (Shy & Ng, 1998).