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- Title
THE TAXONOMIC AND PHYLOGENETIC POSITION OF THE PLESIOSAUROIDEA FROM THE LOWER JURASSIC POSIDONIA SHALE OF SOUTH-WEST GERMANY.
- Authors
Großmann, Franziska
- Abstract
The two plesiosauroid species from the Posidonia shale of Holzmaden, ‘ Plesiosaurus’ guilelmiimperatoris and ‘ Plesiosaurus’ brachypterygius, do not belong to Plesiosaurus but form new monotypic genera. The new genus Hydrorion is erected for ‘ P.’ brachypterygius, and the genus Seeleyosaurus is re-established for ‘ P.’ guilelmiimperatoris. The recently described species Plesiopterys wildii is regarded as a junior synonym of S. guilelmiimperatoris. A short phylogenetic analysis shows that S. guilelmiimperatoris and Muraenosaurus are basal elasmosaurs. H. brachypterygius, Occitanosaurus tournemirensis from France and Microcleidus homalospondylus from England form a monophyletic clade, which is the sister taxon to the Cretaceous elasmosaurs. A palaeobiogeographical comparison of plesiosaur localities in the Lower Jurassic shows distinct palaeobiogeographical zones for the Toarcian, with different plesiosaur taxa in England, Germany and France.
- Subjects
UNITED Kingdom; GERMANY; FRANCE; POSIDONIA; SPECIES; PLESIOSAURIDAE
- Publication
Palaeontology, 2007, Vol 50, Issue 3, p545
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/j.1475-4983.2007.00654.x