A comprehensive analysis of Mesosaurus fossils shows that bones from adults share similarities with land-dwelling animals -- suggesting older Mesosaurus were semi-aquatic, whereas the juveniles spent ...

Producing living young, and not external eggs, is a form of birth that could date back to 280 million years ago or even earlier, a new study suggests. Called viviparity, this form of birth is used by ...

Newly found fossils of embryos from the first aquatic reptiles called mesosaurs — along with a pregnant female — may be the oldest known example of birth given to live young instead of eggs, ...

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 ...

In most narratives, the story of evolution is the story of organisms emerging from the ocean and eventually populating the land. But for some species that evolution also involved a return trip. Dozens ...

An international team of paleontologists has uncovered the oldest known fossil reptile embryos, dating back approximately 280 ...

Newly found fossils of embryos from the first aquatic reptiles called mesosaurs — along with a pregnant female — may be the oldest known example of birth given to live young instead of eggs, ...

The oldest known aquatic reptiles, the mesosaurs, probably spent part of their life on land, reveals a new study published in Frontiers in Ecology and Evolution. The fossilized bones of adult ...