CT scan of an ancient reptile skull reveals little evolutionary change over 22 million years

Elasmosaurids, like the Cardiomorax mukulu reptiles seen here, lived during the Cretaceous Period. They were predators, thriving on fish and other marine life. Credit: Karen Carr Studio Inc.
T.W. Tidwell, who found and uncovered Elasmosaurus morgani, holds a part of the mid-skeleton showing ribs and gastroliths. Credit: SMU/Ellis W. Shuler
Miguel Marx, a former researcher at SMU’s Earth Science department, did a CT scan of a C. mukulu skull found in Angola. Credit: SMU/Diana Vineyard