Spiny Acritarch (IMAGE) University of Bristol Caption This is a spiny acritarch from the Doushantuo biota imaged using synchrotron tomography. The affinities of these fossils are unknown. Credit John Cunningham, University of Bristol. Usage Restrictions None License Licensed 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.