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van der Spoel, Bleeker and Kobayasi, 1993

Diagnosis: Shell hyaline, colorless triangular. Ventral side vaulted. Dorsal side convex, central rib and latero-dorsal ribs well-developed, lock ribs well-developed but small, 19-23 ventral ribs, strongly developed, comb-shaped. Flanks present; lateral lines convex. Lock area small with moderately developed main and lunar tubercle and small minor tubercle. Second lock system present. Lateral spines well-developed. Long hooked lateral spines bend dorsally. Caudal spine and caudal spine mark absent. Dorsal lip with notch, constriction, gutter. Ventral lip normal sized with median depression. Small nose present at base of rostrum. Lip flaps weakly developed; lip bellies strong and low, lip shoulders well-developed. Aperture narrow. Dorsal aperture rim sharp, ventral rim slightly thickened. Inconspicuous hump present but inner hump absent. Protoconch II area projecting moderately. Shell length 6.1 mm, width 5.1 mm.

Diacavolinia ovalis