International Team Unearths Oldest-Ever Reptile Embryos (CNRS)

Dating back 280 million years or so, the oldest known fossil reptile embryos have been unearthed in Uruguay and Brazil. They belong to the ancient aquatic reptiles, mesosaurs. The study of these exceptionally well-preserved fossils suggests that mesosaurs were either viviparous(1) (pushing back this mode of reproduction by 60 million years) or that they laid eggs in advanced stages of development. These finds, published in the journal Historical Biology, were revealed by an international team including Michel Laurin, CNRS senior researcher at the Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CNRS/Museum national d’histoire naturelle/UPMC).

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