Lenz, 1910
The carapace is elongate isosceles triangle in outline, the dorsal surface is depressed. There are three low tubercles on the gastric region and an obscure one on the cardiac; otherwise the dorsal surface is smooth.
The rostrum is very long and slender, its length just one and a half times as long as the proper length of carapace, and its tip trifid. It is projecting forward and obliquely upward at an angle of about 15° against the surface of carapace.
The lateral borders of carapace are unarmed, however, the postero-lateral angles are marked with an acuminate tooth. The posterior border is marked with a small tooth on each side. (Sakai, 1976: 211)
Type locality: Sri Lanka.
Range: Sri Lanka (Lenz, 1910); Japan - Yoron-to, Amami-shoto (Sakai, 1976a).