Pterosaur Skull (image) University of California - Davis Caption The pterosaur Scaphognathus crassirostris was a day-active, flying archosaur. Scleral ring highlighted. Credit Lars Schmitz/UC Davis. Usage Restrictions May be used with credit. 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.