Diacavolinia limbata (d'Orbigny, 1836) forma africana van der Spoel, Bleeker and Kobayasi, 1993
Shell roughly triangular, with brown-purple hue. Dorsal side convex, central rib and latero-dorsal ribs well-developed, lock rib strong. Ventral side vaulted, upper half of ventral side flattened in outline. Twenty-seven ventral ribs strongly developed, comb-shaped. Flanks moderately developed, lateral lines slightly convex. Lock area small, lock mechanism relatively large. Second lock mechanism at upper level of attachment of spines to lateral line. Sculpture of faint growth lines and faint transverse striation. Lateral spines well-developed, slightly bent dorsally, gutter corners well-developed. Caudal spine and caudal spine mark absent. Broad dorsal lip with small notch and gutter, but no constriction. Broad rostrum with small nose at tip of lip. Ventral lip medium-sized, with median depression. No lip flaps; lip belly well-developed and low, lip shoulders small. No hump. Protoconch II area projecting moderately. Shell length: 10.4 mm, width: 8.6 mm.