The Oldest Embryos Ever Discovered Show That Some Prehistoric Reptiles Were Viviparous
This is the oldest embryo ever discovered on Earth, found in Uruguay and Brazil. It is a baby mesosaur, a group of small aquatic reptiles from the early Permian. According to the researchers, it’s the earliest known case of viviparity. The study—published in the journal Historic Biology by Graciela Piñeiroa, Jorge Ferigolob, Melitta Meneghelc and…
