Fossil Dog <i>Cynarctus wangi</i> (IMAGE) University of Pennsylvania Caption A fossil found in Maryland was identified by a University of Pennsylvania doctoral student as belonging to a new species of ancient dog. The hyena-like canine, with massive jaws capable of crushing bone, would have lived approximately 12 million years ago, at a time when massive sharks like megalodon swam in the oceans. Credit Illustration of <i>Cynarctus</i> from "Dogs, Their Fossil Relatives and Evolutionary History." Reprinted and used with permission of the publisher and Mauricio Antón, author of the illustration and copyright owner . Usage Restrictions In context of reporting, with credit information. 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.