NutzelGrundel.indd

• revision - matière potentielle : critique de la paléonto
• mémoire
• mémoire - matière potentielle : sur les cérites fossiles des terrains secondaires du calvados

59 Abstract Two new caenogastropod genera are described from the Liassic (Pliensbachian) Amaltheenton Formation of Franco- nia (South Germany): Pseudokatosira and Francocerithium. Pseudokatosira is a relatively large and high-spired member of the Zygopleuroidea and is based on the type species “Katosira” undulata. The protoconch of this species is reported for the fi st time. Francocerithium is based on the species Francocerithium kochi (MÜNSTER in GOLDFUSS), a small stout cerithioid which is common in the Amaltheenton Formation of Franconia.

• apertures
• aperture
• teleoconch whorls
• turbo kochii
• axial ribs
• spiral ribs
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