Holotype MZ VIII Mg 4244/1 from the Late Callovian (Mid Jurassic) of Łuków (block in glacial drift); lateral and apical view; white arrow indicate demarcation between protoconch and teleoconch

Diagnoza

Protoconch with axial ribs and spiral lirae. Teleoconch with very weak, blunt, spiral and axial ribs. Whorls of teleoconch rounded.

Porównanie

Differs from C. antiquum in having numerous spiral lirae on the protoconch and very weak ornamentation on the teleoconch. The protoconch most similar among the species of Cosmocerithium to that of the Recent Retilaskeya zelandica.

Autekologia

Występowanie geograficzne

Only in type locality

Zasięg czasowy

Bathonian

Materiały muzealne

Twenty shells.

Literatura

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