Specimen MZ VIII Mg 4229/1 from the Callovian (Mid Jurassic) of Łuków (block in glacial drift) in lateral and apical view.

Diagnoza

Obtusely conical protoconch. Shell with wide whorls and possessing adapical ramp  perpendicular to shell axis. Below angulation, teleoconch  ornamented with strong, wide  axial  ribs (17–18  per  whorl) and spiral ribs (4–5  per whorl).  Peristome ellipsoidal with rounded anterior channel. Columellar lip with narrow callus.

Porównanie

Differs from P. formosa in having wider whorls, a perpendicular adapical ramp and a more weakly expressed anterior channel.

Autekologia

Występowanie geograficzne

Europe; in Poland Balin and Łuków (block in glacial drift).

Zasięg czasowy

Mid Jurassic

Materiały muzealne

Material from Europe and four shells from Callovian of Łuków (block in glacial drift) and one from Balin (NHMW 1867/0008/0001).

Literatura

Gründel, J. 2012. Neubearbeitung der von Laube 1867 beschriebenen Gastropoden fauna aus dem mittleren Jura von Balin/Polen. Annalen des Naturhistorischen Museums in Wien. Serie A für Mineralogie und Petrographie, Geologie und Paläontologie, Anthropologie und Prähistorie, 193-288.

Hébert, E. & Eudes-Deslongchamps, E. 1860. Mémoire sur les fossiles de Montreuil-Bellay (Maine-et-Loire). 1re. partie. Céphalopodes et Gastéropodes. Bulletin de la Société linnéenne de Normandie 5, 153–240

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