Cartorhynchus teeth (IMAGE) Field Museum Caption CT scans of the Cartorhynchus fossil showed pebble-shaped teeth hidden from view. The teeth in its upper jaw are highlighted here in purple. Credit Ryosuke Motani et al. Usage Restrictions Please include credit 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.