Infographic (IMAGE) University of the Witwatersrand Caption Sauropterygians had inner ears that closely resembled members of the crocodile family (green) or sea turtles (blue), which also share similar lifestyles and swimming modes. Semi-aquatic sauropterygians with jointed limbs had similar lifestyles to crocodiles. The fully-aquatic plesiosaurs had flippers, much like sea turtles, and have similar shaped inner ears. Credit James Neenan 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.