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Marine reptiles from Middle Triassic of Germany



From: Ben Creisler
bcreisler@gmail.com


A new online paper not yet mentioned on the DML:

Cajus G. Diedrich (2012)
The Middle Triassic marine reptile biodiversity in the Germanic Basin,
in the centre of the Pangaean world.
Central European Journal of Geosciences (advance online publication)
DOI: 10.2478/s13533-011-0060-0


The Middle Triassic fossil reptile localities near Bayreuth (Bavaria,
southern Germany) consist of shallow marine autochthonous glauconitic
marls and terebratulid-rich tempestite carbonates of the newly defined
Bindlach and Hegnabrunn formations. Single bones and incomplete
skeletons of marine reptiles have been recorded in bone beds within in
the Illyrian and Fassanian stages. These include the remains of the
sauropterygians Neusticosaurus sp., Lariosaurus cf. buzzii [1],
Nothosaurus mirabilis [2], Paranothosaurus giganteus [2], Placodus
gigas [3], Cyamodus rostratus [4], Cyamodus münsteri [5], Pistosaurus
longaevus [6], and ichthyosaurs Omphalosaurus sp., and Shastasaurus
sp. or protorosaur Tanystrophaeus conspicuus [7]. New skeletal
reconstructions are based on the osteological analysis of three
dimensionally preserved bones and skeletal remains. The large number
of marine endemic placodont macroalgae feeders (P. gigas) in the
Bayreuth sites coincides with the presence of invertebrate
palaeocommunities that are characteristic of macroalgae meadow
paleoenvironments. Most of the reptile species and genera from the
Bayreuth localities also occur in beds of similar ages from the Monte
San Giorgio (Switzerland/Italy) or Perledo (Italy) lagoonal areas.
Ichthyosaurs and pistosaurs were adapted for open marine conditions,
and may have migrated from the Panthalassa Oceans into the shallow
marine Germanic Basin to reproduce, whereas placodonts and many other
sauropterygians seem to have lived permanently in those shallow marine
habitats, with large squamates and thecodont or smaller archosaurs in
coastal areas.