Specimen ZPAL Ga.9/252 from the Valanginian (Early Cretaceous) of Wąwał in lateral and apical view.

Diagnoza

Shell  broadly  coneshaped,  1.92  times  as  high  as  broad.  Protoconch  highly medioaxial, ornamented by weak abapical axial folds. Teleoconch starting with growth lines only. After 0.25 of the whorl two spiral ribs appearing. Lower rib becoming keel-like on second teleoconch whorl. Spiral ribs crossed by delicate, weakly opisthocyrtic to weakly prosocline axial ribs (167–168 ribs per whorl). Spiral microornamentation usually visible only at intersections with axial ribs.

Porównanie

Differs from the most similar C. kieli in the more densely distributed axial ribs and the presence of microornamentation on the intersections of the spiral and the axial ribs only.

Autekologia

Występowanie geograficzne

Only in type locality.

Zasięg czasowy

Valanginian (Early Cretaceous).

Materiały muzealne

15 shells.

Literatura

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

Schröder, M. 1995. Frühontogenetische Schalen jurassicher und unterkretazischer  Gastropoden aus Norddeutschland und Polen. Palaeontographica, Abteilung A 238, 1–95.