(Rathbun, 1905)
The characteristics of this species are found in the following respects.
1. This species is of median size, its biological minimum is about 28 mm in carapace breadth.
2. The carapace and the cheliped bear faintly crenulate. In the 2nd ambulatory leg the propodus is 2.7 times as long as broad; the dactylus is slender.
3. The merus of the third maxilliped is 0.9 times as long as broad.
4. The first pleopod is slightly curved outwards; the tip of the ultimate segment bears a papilla. The synovial membrane is 4.0 times as long as broad. (Minei, 1973)
Type locality: Okinawa-jima, Japan.
Range: Japan - Amami-Oshima (Minei, 1973), Tokuno-shima (Minei, 1973), Okinawa-jima (Rathbun, 1905, Minei, 1963, 1973, Bott, 1967, 1970, Miyake & Chiu, 1965, Miyake, 1983).