Specimen MZ VIII Mg 4247/1 from the Callovian (Mid Jurassic) of Łuków (block in glacial drift) in lateral, umbilical and apical view.

Diagnoza

Shell littoriniform with shallow incised suture.  Protoconch  sinistral,  hyperstrophic, unornamented. Terminal part of protoconch strongly thickened. Growth lines opisthocyrt. Otherwise shell smooth. Peristome tear-drop shaped, even, complete. Umbilicus circular, medium−sized

Porównanie

Differs from B. laevissima and B. cassiana by being  much more high spired and having a larger protoconch. The overall shell shape is similar to that of Bandellina valvatiforma (Bandel, 1996) but it differs from the latter in having a strongly thickened adult shell peristome.

Autekologia

Występowanie geograficzne

Northern Germany, West Pomerania, and Łuków (block in glacial drift) in Poland.

Zasięg czasowy

Callovian (Mid Jurassic)

Materiały muzealne

Material from Germany, West Pomerania and Three shells from Callovian of Łuków (block in glacial drift), Poland.

Literatura

Gründel, J. 1998b. Heterostropha (Gastropoda) aus dem Dogger Norddeutschlands und Nordpolens. II. Weitere Allogastropoda. Freiberger Forschungshefte C 474, 1–37.

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