image: The ancient mammal Lystrosaurus, a survivor of the Permian-Triassic mass extinction, is shown standing on the shore of a lake in the Karoo Basin of South Africa. This material relates to a paper that appeared in the Oct. 2 2015, issue of Science, published by AAAS. The paper, by P.D. Roopnarine at California Academy of Sciences in San Francisco, CA, and colleagues was titled, "Community stability and selective extinction during the Permian-Triassic mass extinction." view more
Credit: Marlene Donnelly