Specimen ZPAL Ga.9/167 from the Late Callovian (Mid Jurassic) of Łuków (block in glacial drift); lateral view

Diagnoza

Porównanie

Differs from any known juvenile shell Cryptaulax species. Protoconch 1, consisting of 0.75 whorls, is ornamented with a  granulate pattern. Protoconch 2 of 3.25 whorls is ornamented with two spiral keels. At the adapical suture, a row of dash−like pustules is visible. The first whorl of protoconch 2 and the keel are ornamented with small pustules. The first teleoconch whorl is ornamented with distinct axial ribs (about nine ribs per whorl) and two indistinct spiral ribs.

Autekologia

Występowanie geograficzne

Łuków (block in glacial drift), Poland.

Zasięg czasowy

Late Callovian (Mid Jurassic).

Materiały muzealne

One juvenile shell (ZPAL Ga.9/167). 

Literatura

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