Paraorthograptus kimi (image) University at Buffalo Share Print E-Mail Caption A microscope image of a colony of Paraorthograptus kimi, a doomed species of deep-water graptolite. Once common, this species was among those that 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: Michael Melchin 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.