Bott, 1967
The length of the carapace is 0.8 times its greatest breadth and the depth is slightly more than half the length. The dorsal surface behind the postfrontal region is slightly convex in a fore and aft direction. The postfrontal region is covered with indistinct striae. The postorbital and epibranchial regions bear finely crenulate striae. The antero-lateral margin of the carapace bears finely crenulate striae and the postero-lateral margin and the subbranchial region have distinctly many granulated striae and short hairs. The subhepatic and the pterygostomial regions are smooth. The frontal region bears obscure tubercles, and is 0.35 times as broad as the carapace; it is 0.46 times the distance between the external orbital teeth. The orbital margin is smooth but indistinctly crenulate on the ventral. The exopod of the third maxilliped reaches the proximal third of the merus; the merus is about one-third as long as broad.
In the male the 7th abdominal segment is 0.87 times as long as broad and 1.2 times the length of the 6th. The 6th segment is slightly more than half as long as broad. In the first pleopod the ultimate segment is slightly curved inwards; the penultimate segment is 5.2 times the length of the ultimate; the synovial membrane is 3.7 times as long as broad.
The chelipeds are unequal in males, but subequal in females. The carpus of the large cheliped bears indistinct striae, armed with one large spine and one spinule internally. The palm is smooth. The fingers bear a series of 8 to 10 blunt small teeth and have a gape when the fingers are closed. The palm is 0.88 times as long as broad, 0.71 times the length of the dactylus and 0.45 times the length of the chela. The palm and the carpus of the small cheliped bear crenulate and short striae. The fingers are not gaping when closed, with a series of 10 to 12 small teeth on each of the cutting edges. The ambulatory legs are slender, and bear short hairs on the propodus and the dactylus. The 2nd ambulatory leg is 1.5 times the breadth of the carapace; the propodus is 2.5 times as long as broad, and bears one row of spinules dorsally and two rows of spinules ventrally. The dactylus bears each two rows of spinules dorsally and ventrally; fourteen spinules arranged in two rows are present ventrally. (Minei, 1973)
Type locality: Candidius Lake, Taiwan.
Range: Japan - Ishigaki-jima and Iriomote-jima (Minei, 1973), Ishigaki-jima (Miyake, 1983), Ishigaki-jima, Iriomote-jima, and Uotsuri-jima (Minei, 1981); Taiwan - (Minei, 1974), Candidius Lake and near Taipei (Bott, 1967, 1970).