Specimen ZPAL Ga.9/33 from the Late Callovian (Mid Jurassic) of Łuków (block in glacial drift) in lateral view.

Diagnoza

Demarcation from teleoconch not clearly visible, opisthocyrtic with intermediate zone. Teleoconch beginning with medial row of tubercles that later transformed into keel-like rib. Whorls angulated with keel-like rib. First whorl of teleoconch also ornamented with axial ribs and weak spiral ribs below medial rib. On second whorl of teleoconch, spiral ribs also appearing above medial rib. Axial ribs absent on later whorls. Base demarcated by second spiral keel. Anterior canal with long spine-like extension that strongly bent posteriorly.

Porównanie

Very similar to Pietteia pellatiare and differ mainly with regard to shell size and ornamentation of the first teleoconch whorl.

Autekologia

Występowanie geograficzne

Europe; in Poland Łuków

Zasięg czasowy

Late Jurassic

Materiały muzealne

Over 20 shells from Callovian of Łuków (ZPAL).

Literatura

Cossmann, M. 1904. Essais de Paléoconchologie Comparée. Sixième Livraison.151 pp. M. Cossmann, F.R. de Rudeval, Paris

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

Makowski, H. 1952. La Faune Callovienne de Łuków en Pologne. Palaeontologica Polonica 4, 1–64.

Münster, G.G., zu 1844. Petrefacta Germaniae, Dritter Theil In: G.A. Goldfuss (ed.), Petrefacta Germaniae, Dritter Theil. 128pp. Arnz and Comp., Düsseldorf.

Piette, M. 1864–1891.Terrain Jurassique. Gastéropodes.Paléontologie Française 3: 1–535. Issued in parts: 1864, 1–48 ; 1866,49–96; 1867, 97–144; 1869, 145–192; 1876, 193–336; 1882, 337–400; 1891, 401–535.