Topic
mammalian evolution
2 stories related to this topic, newest first.
Substrate placeholder — needs reviewworld91 days ago
Fossil Analysis Shows Mammalian Ancestors Laid Hard-Shelled Eggs 250 Million Years Ago
An analysis of a fossil from South Africa reveals that mammalian ancestors laid hard-shelled eggs 250 million years ago. The study, published in Plos One, details findings from a Lystrosaurus embryo. Researchers used X-ray techniques to confirm the egg's structure.
Substrate placeholder — needs reviewworld94 days ago
Fossil Embryo Confirms Egg-Laying Reproduction in Mammalian Ancestors from 250 Million Years Ago
Scientists have identified a 250-million-year-old fossilized embryo of Lystrosaurus in South Africa, providing the first definitive evidence that therapsids, ancestors of mammals, laid eggs. The specimen, discovered in 2008, was analyzed using advanced X-ray scanning to reveal an…