Specimen ZPAL Ga.9/211 from the Mid Bathonian (Mid Jurassic) of Gnaszyn, Częstochowa region; lateral, umbilical and apical view

Diagnoza

Shell very broadly conical. Flanks of the whorls convex; sutures distinct. First teleoconch whorl smooth, following whorl with broad spiral ribs. Base also covered with ribs. Axial ribs not present. Base slightly convex. Zone between flanks of whorls and base continuous, rounded. Aperture broadly oval. Inner lip with broad callus and a halfmoon−shaped cavity on columella.

Porównanie

The most similar extant genera are Trochus and Gibbula.

Autekologia

Występowanie geograficzne

West Pomerania and Gnaszyn, (Częstochowa region), Poland.

Zasięg czasowy

Mid Bathonian to Mid Callovian

Materiały muzealne

Material described by Gründel  and three juvenile shells from Gnaszyn near Częstochowa, Poland, Mid Bathonian.

Literatura

Gründel, J. 2000a. Archaeogastropoda aus dem Dogger Norddeutschlands und des nordwestlichen Polens. Berliner Geowissenschaftliche Abhandlungen, Reihe E34, 205–253.

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