Plesiosaurs

@article{Smith2008Plesiosaurs,
  title={Plesiosaurs},
  author={Adam S. Smith},
  journal={Geology Today},
  year={2008},
  volume={24}
}
  • Adam S. Smith
  • Published 2008
  • Geography, Environmental Science
  • Geology Today
Plesiosaurs are an unusual and intriguing group of extinct aquatic reptiles ( Fig. 1 ). They are sauropterygians, a group known from an array of semi‐aquatic forms during the Triassic period: placodonts, pachypleurosaurs and nothosaurs. The first plesiosaurs are known from the very latest Triassic, but by the Early Jurassic plesiosaurs were cosmopolitan in distribution and lasted successfully to the latest Cretaceous, when they became victims of the K‐T extinction event. Plesiosaurs were… 
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Crayfish gastroliths

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References

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Abstract The dichotomy between short-necked, large-headed “pliosaurs” and long-necked, small-headed “plesiosaurs” has formed the basis of plesiosaur taxonomy for over one hundred years. Recent work

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TLDR
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