The earliest possible choristodere (Diapsida) and gaps in the fossil record of semi-aquatic Reptiles

@article{Storrs1993TheEP,
  title={The earliest possible choristodere (Diapsida) and gaps in the fossil record of semi-aquatic Reptiles},
  author={Glenn W. Storrs and David J. Gower},
  journal={Journal of the Geological Society},
  year={1993},
  volume={150},
  pages={1103 - 1107}
}
  • G. Storrs, D. Gower
  • Published 1 November 1993
  • Environmental Science, Geography, Biology
  • Journal of the Geological Society
New fossil material of the problematic reptile species Pachystropheus rhaeticus from the uppermost Triassic (Rhaetian) of England, and re-examination of other specimens, demonstrate that it may be the earliest known example of the Choristodera, a poorly understood group of semi-aquatic diapsid reptiles. As a result, the fossil record of choristoderes is extended back in time by approximately 45 million years and a significant gap in the fossil record of these reptiles is highlighted. Failure of… 

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TLDR
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References

SHOWING 1-10 OF 56 REFERENCES
Fossil vertebrate faunas of the British Rhaetian (latest Triassic)
  • G. Storrs
  • Environmental Science, Geography
  • 1994
TLDR
Rhaetian fossil vertebrate faunas of Britain represent rich but biased samples of taxonomic diversity during uppermost Triassic time, and analysis of element abundance in the disarticulated Westbury Formation assemblage indicates that many parts of some taxa are never preserved while other elements of the same form are common.
Regular ArticleFossil vertebrate faunas of the British Rhaetian (latest Triassic)
  • G. Storrs
  • Environmental Science, Geography
  • 1994
TLDR
Analysis of element abundance in the disarticulated Westbury Formation assemblage indicates that many parts of some taxa are never preserved while other elements of the same form are common, suggesting that many species may be missing entirely from this long-studied but poorly understood taphocoenosis.
AMNIOTE PHYLOGENY AND THE IMPORTANCE OF FOSSILS
TLDR
The importance of the critical fossils seems to reside in their relative primitive‐ness, and the simplest explanation for their more conservative nature is that they have had less time to evolve.
Simoedosaurus dakotensis, new species, a diapsid reptile (Archosauromorpha; Choristodera) from the Paleocene of North America
ABSTRACT A partly complete skeleton from the late Paleocene of western North Dakota is described as Simoedosaurus dakotensis, n. sp., and is compared with European individuals of the genus. This
The skull of Cteniogenys, a choristodere (Reptilia: Archosauromorpha, from the Middle Jurassic of Oxfordshire
TLDR
Comparison with known choristoderes, based on an analysis of 53 derived character states, suggests that Ctemogenys is the most primitive of known genera, which supports recent analyses which conclude that Champsosaurus and Simoedosaurus are derived from archosauromorph diapsids, not lepidosauromorphics as once thought.
A palaeospinacid shark from the Upper Triassic of south-west England
  • C. Duffin
  • Environmental Science, Geography
  • 1982
TLDR
The fin spines of a new neoselachian shark are described from die Upper Triassic of Aust Cliff, Avon and Holwell, near Frome in Somerset and extends the range of the palaeospinacid sharks into the Rhaetian.
Un Choristodera (Eosuchia?) insolite du Crétacé Inférieur de Mongolie
KurzfassungBeschreibung von Knochenresten einer neuen Gattung der Choristodera der mongolischen Unterkreide (Lepidosauria):Khurendukhosaurus orlovi n. gen. n. sp. Die Familien-Zugehörigkeit, für die
Vertebrate Paleontology and Evolution
"Carroll has to his credit an immense amount of useful labour in writing the book and will probably corner the market for a vertebrate paleontology text for the rest of this century." Nature
...
...