Specimen ZPAL Ga.9/247 from the Valanginian (Early Cretaceous) of Wąwał in lateral and apical view.

Diagnoza

Shell elongated, 2.44 times as high as broad. Early portion of protoconch sinistral, changing into dextral during ontogeny. Hyperstrophy hardly  visible. Protoconch peristome with sinusigera lip. Teleoconch ornamented with one prominent rib and about 15 weaker ribs. Whorls at prominent rib distinctly angulated. Spiral ribs crossed by sinusoidal axial ribs (60–61 ribs per whorl). Base demarcated by an additional, prominent spiral rib, otherwise ornamented like lateral flanks of whorls. Peristome rounded, columellar area with narrow inner lip.

Porównanie

Differs from the most similar C. boczarowskii in having densely spaced axial ribs and by being hardly visible hyperstrophy.

Autekologia

Występowanie geograficzne

Only in type locality.

Zasięg czasowy

Valanginian (Early Cretaceous).

Materiały muzealne

ZPAL: seven 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.