A plesiosaur humerus (IMAGE) University of Bath Caption A plesiosaur humerus identified from the anicent riverbed Credit Credit: Dr Nick Longrich/University of Bath Usage Restrictions Credit: Dr Nick Longrich/University of Bath License Original 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.