Gatunek typowy
Cerithium beyschlagi Wollemann 1903 ; Aptian-Albian beds of northern Germany

Opis

Procerithiid-like teleoconch and large protoconch that consists of more than four whorls with smooth first whorl succeeding the smooth embryonic shell about 0.1 mm in diameter; the following larval shell with about 20 axial ribs; later supplemented with spiral lirae and the axial ribs that twist adaperturally low on the whorl, almost completely covered by later whorls; larval shell has a strong apertural projection in very low position of the outer lip; teleoconch is omamented by strong, straight axial ribs and fine spiral striae; aperture is elongate and provided with an anterior siphonal canal.

Synonimy

Zasięg czasowy

Mid Jurassic (Callovian) to Early Cretaceous (Albian)

Literatura

Schröder, M. 1995. Frühontogenetische Schalen jurassischer und unterkretazischer Gastropoden aus Norddeutschland und Polen. Palaeontographica A, 238: 1‒95.