fossil marine snail shell_2 (IMAGE) University of Texas at Austin Caption A fossilized shell belonging to the extinct snail species Sinuarbullina yangouensis that was examined by researchers. The shell is in pristine condition. Credit William Foster et al. Usage Restrictions Credit must be given to the creator. License CC BY 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.