Side view of Leanchoilia fossil (IMAGE) University of Arizona Caption Side view of Leanchoilia showing its distinctive head shield followed by 11 segments ending in a triangular "tail." Scale bar is 2 millimeters. Credit Nicholas Strausfeld Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. License Original 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.