Holotype ZPAL Ga.9/41 from the Mid Bathonian (Mid Jurassic) of Faustianka (Częstochowa region) in lateral and apical view.

Diagnoza

Obtuse conical protoconch consisting of 2,5 smooth whorls. Teleoconch beginning with two blunt spiral keels and opisthocline axial ribs restricted to area somewhat above and beneath upper keel. On second whorl of teleoconch, upper keel composed of four subordinate spiral ribs, axial ribs restricted to surface of keel only. Lower keel much weaker, ornamented with weak axial ribs. During ontogeny, lower keel and axial ribs get weaker, and finally disappear. Surface of later whorls smooth.

Porównanie

Similar to D. cochleata but it differs from it in having stronger axial ribs on the first two whorls of the teleoconch while the later whorls are smooth.

Autekologia

Występowanie geograficzne

Częstochowa region and West Pomerania, Poland.

Zasięg czasowy

Procerites progracilis Zone, Mid Bathonian (Mid Jurassic).

Materiały muzealne

Over 50 shells from Faustianka (Częstochowa region, ZPAL) and part of material from West Pomerania assigned to Dicroloma cochleata (Quenstedt, 1858) by Gründel (2001).

Literatura

Gründel, J. 2001. Nerithimorpha und weitere Caenogastropoda (Gastropoda) aus dem  Dogger Norddeutschlands und desnordwestlischen 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.