Specimen MZVIII Mg 4232/1 from the Callovian (Mid Jurassic) of Łuków (block in glacial drift); lateral and apical view.

Diagnoza

Porównanie

The relative size of the teleoconch studied is smaller than that of Calliotropis biarmata. Also, ornamentation differs in having an additional rib on the fifth and later whorls. Nevertheless, both forms are closely similar to each other.

Autekologia

Występowanie geograficzne

Łuków (block in glacial drift), Poland.

Zasięg czasowy

Late Callovian.

Materiały muzealne

One shell (MZ VIII Mg 4232/1). 

Literatura

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