Ostracod (with Shell) (image) University of Leicester Caption The fossil is illustrated with its shell. Credit David J. Siveter, Derek E. G. Briggs, Derek J. Siveter and Mark D. Sutton Usage Restrictions Use only 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.