van der Spoel, Bleeker and Kobayasi, 1993
Diagnosis: Shell colorless, hyaline. Dorsal side convex, central rib and latero-dorsal ribs well-developed, lock ribs well-developed but small. Ventral ribs, 23, strongly developed, comb-shaped. Flanks present. Lock area small, main and lunar tubercles normal, minor tubercle absent. Secondlock system present. Sculpture of faint growth lines and faint transverse striation. Short lateral spines bent dorsally, hooked and sharp. Caudal spine and caudal spine mark absent. Dorsal lip with notch but no constriction; gutter present. Characteristic ventral lip with median depression, ventral side convex. No lip flaps; lip bellies pronounced, lip shoulders small. Aperture wide, rim sharp, ventral rim slightly thicker. No hump. Protoconch II area projecting moderately. Shell length 6.8 mm width 5.4 mm.