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van der Spoel, Bleeker and Kobayasi, 1993

Diagnosis: Shell hyaline, triangular. Brown hue especially on lower ventral and dorsal sides. Ventral side vaulted. Thin ventral ribs straight. Dorsal side convex, with well-developed central and lateral ribs. Lateral lines slightly convex, flanks not very clear. Lock rib moderately developed, lock area and main tubercle and link medium sized; lunar and minor tubercles rather small, all tubercles close together. Second lock mechanism present. Sculpture of faint growth lines and faint transverse striation. Lateral spines large, not bent, sharp and lanceolate. Gutter corners small. Caudal spine and caudal spine mark absent. Broad dorsal lip with notch and gutter, but no constriction. Both ventral and dorsal lips with thickened rim, ventral lip moderately sized with weak median depression. Traces of lip flaps sometimes present; well-developed lip bellies, lip shoulders very small. Hump absent. Protoconch II area not strongly projecting. Shell length 7.8 mm and width 7.8 mm.

Diacavolinia bicornis