The oldest known amniotic embryos suggest viviparity in mesosaurs

@article{Pieiro2012TheOK,
  title={The oldest known amniotic embryos suggest viviparity in mesosaurs},
  author={G. Pi{\~n}eiro and Jorge Ferigolo and M. Meneghel and M. Laurin},
  journal={Historical Biology},
  year={2012},
  volume={24},
  pages={620 - 630}
}
The earliest undisputed crown-group amniotes date back to the Late Carboniferous, but the fossil record of amniotic eggs and embryos is very sparse, with the oldest described examples being from the Triassic. Here, we report exceptional, well-preserved amniotic mesosaur embryos from the Early Permian of Uruguay and Brazil. These embryos provide the earliest direct evidence of reproductive biology in Paleozoic amniotes. The absence of a recognisable eggshell and the occurrence of a partially… Expand
Reproduction in Early Amniotes
Evolution of viviparous reproduction in Paleozoic and Mesozoic reptiles.
Integrating developmental biology and the fossil record of reptiles.
Live birth in an archosauromorph reptile
The Feeding Habits of Mesosauridae
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