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 [1] lived in the Cretaceous period, from Hauterivian age to Barremian age.[2]

Pseudothurmannia
Temporal range: Cretaceous, 136.4–99.7 Ma [1]
Fossil shells of Pseudothurmannia species from Alpes-de-Haute-Provence, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Ancyloceratoidea
Family:
Crioceratitidae
Genus:
Pseudothurmannia

Spath, 1923
Synonyms
  • Kakabadziella Hoedemaeker and Herngreen, 2003
  • Parathurmannia Busnardo, 2003
  • Prieuriceras Vermeulen, 2004

Species

[3]

  • 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 centimetres (1.6–4.7 in). 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.[1]

References
  1. The Paleobiology Database
  2. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopoda
  3. Klein, J. et al., 2007. FOSSILIUM CATALOGUS I:ANIMALIA Pars 144, Lower Cretaceous Ammonites III Bochianitoidea, Protancyloceratoidea, Ancyloceratoidea, Ptychoceratoidea.


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