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

 * Pseudothurmannia angulicostata d'Orbigny, 1863
 * Pseudothurmannia belimelensis Dimtrova, 1967
 * ?Pseudothurmannia biassalensis Dimtrova, 1967
 * Pseudothurmannia catulloi Parona, 1898
 * ?Pseudothurmannia crimensis Wiedmann, 1962
 * Pseudothurmannia grandis Busnardo, 1970
 * Pseudothurmannia isocostata Kakabadze, 1981
 * Pseudothurmannia karakaschi Manolov, 1962
 * Pseudothurmannia lurensis Busnardo, 1970
 * Pseudothurmannia macilenta d'Orbigny, 1841
 * Pseudothurmannia mortilleti Pictet and de Loriol, 1858
 * Pseudothurmannia ohmi Winkler, 1868
 * Pseudothurmannia picteti Sarkar, 1955
 * Pseudothurmannia provencalis Wiedmann, 1962
 * Pseudothurmannia pseudomalbosi Sarasin and Schandelmayer, 1901
 * Pseudothurmannia renevieri Sarasin and Schöndelmayer, 1901
 * Pseudothurmannia rugosa Busnardo, 2003
 * Pseudothurmannia sarasini Sarkar, 1955

Description
Shell of Pseudothurmannia species can reach a diameter of about 4 - 12 cm. 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, Bulgaria, Czechoslovakia, France, Hungary, Italy, Japan, Morocco, Spain, Russia and United States.