Oldest known sea turtle

@article{Hirayama1998OldestKS,
  title={Oldest known sea turtle},
  author={Ren Hirayama},
  journal={Nature},
  year={1998},
  volume={392},
  pages={705-708}
}
  • R. Hirayama
  • Published 16 April 1998
  • Environmental Science, Geography
  • Nature
Reptiles constitute a primarily terrestrial assemblage, but several groups returned to the marine environment after the first appearance of reptiles in the late Palaeozoic era. Successful diversification of the chelonioid sea turtles, particularly during the Cretaceous period, was perhaps one of the most important events in the history of turtles (and marine reptiles). The fossil record of chelonioids before the Late Cretaceous has been poorly documented. Here I report the discovery of an… 
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The Evolution of Marine Reptiles
  • R. Motani
  • Environmental Science, Geography
    Evolution: Education and Outreach
  • 2009
TLDR
There were more than a dozen groups of marine reptiles in the Mesozoic, of which four had more than 30 genera, namely sauropterygians (including plesiosaurs), ichthyopterygian, mosasaurs, and sea turtles, who explored many different swimming styles and diets.
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