Holotype MZ VIII Mg 4251/1 from the Late Callovian (Mid Jurassic) of Łuków (block in glacial drift) in lateral and apical view.

Diagnoza

Shell elongate, 1.85 times as high as broad. Protoconch medioaxial, smooth. Teleoconch starting with one prominent and one subsutural spiral rib. Whorls angulated at medial spiral ribs, which are almost keel-like. Spiral ribs crossed by prosocline axial ribs.

Porównanie

P. gruendeli is similar to P. naricata but it differs by the smooth protoconch, stable number of spiral ribs, and the abapical spiral rib forming the incipient keel.

Autekologia

Występowanie geograficzne

Only in type locality.

Zasięg czasowy

Callovian (Mid Jurassic).

Materiały muzealne

Two shells.

Literatura

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