Fossil Lystrosaurus (IMAGE) Field Museum Caption A fossil of the dicynodont Lystrosaurus, a mammal relative that survives the end-Permian mass extinction event, is collected during fieldwork in South Africa's Karoo Basin. Credit Roger Smith Usage Restrictions Please include credit to Roger Smith License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.