Pseudothurmannia


Pseudothurmannia is a genus of extinct cephalopods belonging to the subclass Ammonoidea and included in the family Crioceratitidae of the ammonitid superfamily Ancylocerataceae. These fast-moving nektonic carnivores lived in the Cretaceous period, from Hauterivian age to Barremian age.

Species

Shell of Pseudothurmannia species can reach a diameter of about. They show flat or slightly convex sides, a surface with dense ribs and a subquadrate whorl section.

Distribution

Fossils of species within this genus have been found in the Cretaceous rocks of Antarctica, Czechoslovakia, France, Hungary, Italy, Japan, Morocco, Spain, Russia and United States.