Skeletons of <i>D. szalayi</i> (IMAGE) Yale University Caption Composite (left) and reconstructed (right) skeletons of D. szalayi, the oldest known ancestor of primates. (Bloch, et al./ PNAS) Credit Bloch, et al./ PNAS Usage Restrictions with credit given 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.