Gatunek typowy
Ataphrus crassus Gabb, 1858. Late Cretaceous, Martinez, California, USA

Opis

Shell trochiform, non−umbilicate shell with rounded sides, subcircular to ovate aperture, and generally smooth exterior, protoconch of less than one whorl; outer face of columellar lip smooth or with basal denticle, and not limited by a strong carina; base without median callus pad.

Synonimy
Plocostylus Gemmelaro, 1878

Zasięg czasowy

Early Jurassic to Late Cretaceous (Maastrichtian)

Literatura

Gabb, W.M. 1869. Cretaceous and Tertiary fossils. California Geological Survey, Paleontology 2, 1–299.

Kaim, A. 2004. The evolution of conch ontogeny in Mesozoic open sea gastropods. Palaeontologia Polonica 62, 3–183.