Styracograptus tubuliferus (image) University at Buffalo Share Print E-Mail Caption A microscope image of a colony of Styracograptus tubuliferus, an ancient, deep-water graptolite that belonged to a lineage of graptolites that later disappeared during the end-Ordovician mass extinction. Each colony consists of a chain of tubes that make up a communal edifice, and each tube housed an individual graptolite animal. Credit Credit: Charles E. Mitchell Usage Restrictions This image may only be used in conjunction with news stories discussing the research described in the associated press release. Share Print E-Mail 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.