Specimen ZPAL Ga.9/25 from the Bathonian (Mid Jurassic) of Kłobuck borehole 22 (Częstochowa region) in lateral and apical view.

Diagnoza

Shell elongate, 2.6 as high as broad. Protoconch hyperstrophic, smooth. Teleoconch starting with two prominent and one subsutural spiral ribs. Whorls angulated at lower spiral rib. Spiral ribs crossed by weaker, prosocline axial ribs (about 37–38 per whorl).

Porównanie

P. conoidea has a much broader shell than P. concava. The most important difference from P. naricata is the stable number of spiral ribs and the stronger lower spiral rib.

Autekologia

Występowanie geograficzne

Germany and Poland (only Kłobuck borehole).

Zasięg czasowy

Bajocian/Bathonian (Mid Jurassic).

Materiały muzealne

Material from Germany and one shell from Bajocian/Bathonian of the Kłobuck borehole (Częstochowa region).

Literatura

Gründel, J. 1997. Heterostropha (Gastropoda) aus dem Dogger Norddeutschlands und Nordpolens. I. Mathildoidea (Mathildidae). Berliner Geowissenschaftliche Abhandlungen, Reihe E25, 131–175.

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