Diagnoza

The whorls increase rapidly in height, their flanks are weakly convex and smooth. The growth lines are weakly opisthocyrt and slightly prosocline on the lateral flanks, while they become clearly prosocyrt on the base that is evenly convex. The large drop-like aperture is pointed posteriorly.

Porównanie

The shells described as Pictavia elegans (Morris & Lycett, 1851) by Gründel & Kaim, 2006 may represent juveniles of P. collisa.

Autekologia

Występowanie geograficzne

France; in Poland only Kłęby (Western Pomerania).

Zasięg czasowy

late Oxfordian.

Materiały muzealne

Material from France (MNHN, UPMC) and single specimen (BGR X 05192) illustrated by Schmidt (1905).

Literatura

Gründel, J & Kaim, A. 2006. Shallow-water gastropods from Late Oxfordian sands in Kłęby (Pomerania, Poland). Acta Geologica Polonica 56, 121‒157.

Loriol, P. & Pellat, E. 1874. Monographie Paléontologique et géologique des étages supérieurs de la Formation Jurassique des environs de Boulogne-sur-Mer (Pt. 1). Mémoires de la Société de Physique et d’Histoire Naturelle de Geneve, 23, 261-407.

Schmidt, M. 1905. Über Oberen Jura in Pommern. Abhandlungen der Königlich Preußsischen Geologischen Landesanstalt und Bergakademie, Neue Folge, 41, 1‒222.