Bone surface texture (IMAGE) University of Portsmouth Caption Scanning electron microscope images of bone surface texture of the pterosaur jaws. A-D shows juvenile pterosaurs and E shows a more mature individual. Credit University of Portsmouth Usage Restrictions No restrictions. License Public Domain 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.