Holotype MZ VIII Mg 4225/1 from the Late Callovian (Mid Jurassic) of Łuków (block in glacial drift) in lateral and apical view.

Diagnoza

Protoconch ornamented with adapical spiral row of tubercles and axial, very weakly prosocline (almost orthocline) riblets, extending from upper periphery to abapical suture. Distance between row of tubercles and axial riblets of protoconch short. Teleoconch starting with strong opisthocline axial ribs and pustules arranged into spiral threads. On the later teleoconch whorls, axial ribs vanishing and pustules becoming randomly distributed.

Porównanie

The protoconch is similar to T. calloviana but  the teleoconch differs significantly in the  continuous reduction of the axial ribs and the arrangement of  the pustules.

Autekologia

Występowanie geograficzne

Only in type locality

Zasięg czasowy

Quenstedtoceras lamberti Zone, Late Callovian (Mid Jurassic).

Materiały muzealne

One shell from the type locality.

Literatura

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