Gatunek typowy
Sinuarbullina ansorgi Gründel, 1997. Bathonian (Mid Jurassic), Kłęby borehole 1/37, Western Pomerania, Poland.

Opis

Spindle−like  shell. Protoconch hyperstrophic, transaxial to medioaxial, smooth or with abapically enhanced growth lines. Protoconch deeply sunken into first teleoconch whorl. Teleoconch whorls with narrow, rounded ramp gradually changing into lateral flank of whorl. Teleoconch surface smooth apart from prosocyrtic growth lines strongly bent posteriorly before ramp, curved back to anterior at ramp. Peristome elongated, tear−drop shaped, narrowed posteriorly, rounded anteriorly. Columellar area covered by inner lip.

Synonimy

Zasięg czasowy

Early to Mid Jurassic.

Literatura

Gründel, J. 1997b. Heterostropha (Gastropoda) aus dem Dogger Norddeutschlands und Nordpolens. III. Opisthobranchia. Berliner Geowissenschaftliche Abhandlungen, Reihe E 25, 177–223.

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