An international team of paleontologists has unearthed the oldest known fossil reptile embryos dating back about 280 million years. An artist’s reconstruction of the mesosaur egg (Gustavo Lecuona) The study, published in the journal Historical Biology, reports well-preserved amniotic embryos of mesosaur, the ancient aquatic reptile, from the Early Permian of Uruguay and Brazil. This discovery suggests that mesosaurs were either viviparous (pushing...
