Hesperancilla matthewsi (Burch & Burch, 1967)

Distribution: Tropical Atlantic realm. Tropical Southwestern Atlantic province (NE Brazil).

This is the type species of Hesperancilla Kilburn, 1981.

RV 2340. Brazil, Rio Grande do Norte, Natal. Ex pisce, from "Pacamon" fish. January 1985. Scale bar is 1 cm.

This species is about the same size as Ancilla faustoi Matthews, Matthews & Dijck, 1977, which occurs in the same region. That species, however, lacks the conspicuous crenulated ancillid groove and columellar projection.