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van der Spoel, Bleeker and Kobayasi, 1993

Diagnosis: Shell hyaline, subquadrangular in outline, with brown hue over entire surface. Ventral side vaulted. Nineteen conspicuous, comb-shaped ventral ribs. Dorsal side flat with moderately developed central and latero-dorsal ribs; lock ribs moderate, lock area large with large main tubercle, large link, large lunar, and small minor tubercle. Second lock system present. Lateral lines slightly convex, flanks clearly developed. Growth lines typical; sculpture ribs on dorsal side. Lateral spines small, not bent, placed relatively far anteriorly, hooked but not very sharp at tip. Gutter corners small. Caudal spine and caudal spine mark absent. Ventral lip large with weak median depression. Strongly bent dorsal lip with notch in relatively broad rostrum, constriction and gutter present. No lip flaps; large lip bellies and strong lip shoulders, aperture extremely narrow. Hump absent. Protoconch II area not projecting, with moderate caudal joint. Shell length 5.6 mm, width 5.3 mm.

Diacavolinia constricta