Diagnoza

The shell with fine but distinctive spiral lirae, more distinct on juvenile whorls. Even on the largest specimens a small but deep umbilicus is present. The callus is expanded in the lower part of inner lip into a crescent-like lobe orientated slightly oblique to the shell

Porównanie

Differs from any other species of Ataphrus, apart from A. compactus (Gabb, 1869) from the Late Cretaceous of California (USA), in having spiral sculpture. The latter species differs in the absence of umbilicus.

Autekologia

Występowanie geograficzne

Kłęby (Western Pomerania), Poland

Zasięg czasowy

late Oxfordian.

Materiały muzealne

Six specimens (BGR, Buchholz, and Beckert collections).

Literatura

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

Gründel, J & Kaim, A. 2006. Shallow-water gastropods from Late Oxfordian sands in Kłęby (Pomerania, Poland). Acta Geologica Polonica 56, 121‒157.