Fossilized Leanchoilia brain (IMAGE) University of Arizona Caption View of the anterior part of the fossil photographed in direct light and showing the dark traces of sideward eyes, prosocerebrum (the palest traces) and segmental ganglia. The scale bar equals 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.