Shells of amoebozoa testate amoebae (IMAGE) Mississippi State University Caption Pictured are two shells of amoebozoa testate amoebae, a diverse lineage of heterotrophic microeukaryotes. The left shell is a cryogenian fossil specimen, estimated to have lived approximately 700 million years ago, while the right shell is a specimen of a modern group of amoebozoan testate amoebae. Credit Photo by Luana Morais and João Alcino) Usage Restrictions n/a 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.