Key to Genera Lectures
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Marssonella oxycona Brunswick County NC, USA Maastrichtian Upper Cretaceous Cretaceous  | Marssonella oxycona Wattenscheid, Germany Turonian Upper Cretaceous Cretaceous  | Marssonella oxycona Wattenscheid, Germany Turonian Upper Cretaceous Cretaceous  |
Marssonella oxycona Wattenscheid, Germany Turonian Upper Cretaceous Cretaceous  | Marssonella oxycona Wattenscheid, Germany Turonian Upper Cretaceous Cretaceous  | Marssonella oxycona Wattenscheid, Germany Turonian Upper Cretaceous Cretaceous  |
Marssonella oxycona Weillohe, Germany Coniacian Upper Cretaceous Cretaceous  | Marssonella sp. --- Laegerdorf, Germany Maastrichtian Upper Cretaceous Cretaceous  | Marssonella trochus Brunswick County NC, USA Maastrichtian Upper Cretaceous Cretaceous  |
Marssonella trochus (d'Orbigny, 1840) Laegerdorf AH22, Germany Campanian Upper Cretaceous Cretaceous  | Marssonella trochus Stubbenkammer, Germany Maastrichtian Upper Cretaceous Cretaceous  |