Summary (IMAGE) University of Bonn Caption Bones with a sponge-like structure are clear indications for an aquatic lifestyle, but the ribs alone did not allow for sufficient ventilation. Credit © The New York Academy of Sciences Usage Restrictions None 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.