Specimen ZPAL Ga.9/99 from the Mid Bathonian (Mid Jurassic) of Gnaszyn in lateral and apical view; white arrow indicate demarcation between protoconch and teleoconch.

Diagnoza

Shell elongate, 4.9 times as high as broad. First half of protoconch 2 whorl ornamented exclusively with pustules. Afterwards three spiral ribs appearing. Axial ribs appearing on second whorl  of  protoconch  2.  Adapicalmost  spiral  rib  disappearing  on  third  whorl.  Abapical  ribs  becoming keel-like. Axial ribs weakly opisthocyrtic. Teleoconch ornamented with net of spiral and axial ribs pointed at intersections. Number of spiral ribs ranging from four at first teleoconch whorl to eight at sixth. Number of axial ribs increasing from 18 to 26 per whorl.

Porównanie

Autekologia

Występowanie geograficzne

Germany and Gnaszyn in Poland

Zasięg czasowy

Bathonian

Materiały muzealne

Material from Germany and over 100 shells from Poland (ZPAL).

Literatura

Gründel, J. 2001. Nerithimorpha und weitere Caenogastropoda (Gastropoda) aus dem  Dogger Norddeutschlands und des nordwestlischen Polens. Berliner Geowissenschaftliche Abhandlungen, Reihe E36, 45–99.

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