Specimen ZPAL Ga.9/202 from the Bathonian (Mid Jurassic) of Faustianka (Częstochowa region) in lateral and apical view.

Diagnoza

Low spired shell. Sinistral protoconch, hyperstrophic,  unornamented. Terminal part of protoconch weakly thickened. Growth lines prosocline, otherwise shell smooth. Peristome circular, even,complete, slightly elongated anteriorly. Umbilicus circular, wide open.

Porównanie

Similar to B. cassiana but the differs in having fewer  whorls of the protoconch and the peristome slightly elongated anteriorly. It resembles B. magna (Gründel, 1998), which nevertheless differs by a more planispirally coiled teleoconch.

Autekologia

Występowanie geograficzne

West Pomerania (borehole Kłęby) and Częstochowa region (Faustianka, Gnaszyn) in Poland.

Zasięg czasowy

Bathonian (Mid Jurassic)

Materiały muzealne

Material from Kłęby (West Pomerania), three shells from the Mid Bathonian of Faustianka and one shell from the Bathonian of Gnaszyn, both Częstochowa region, Poland (ZPAL).

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.