Fossil of Extinct Armored Worm (IMAGE) Yale University Caption Fossil (left) and depiction (right) of extinct armored machaeridian worm. Colors indicate the trunk (yellow), limb (red), bristles (gray), attachment of shell plates (green), gut (purple) and dorsal linear structure (blue) Credit Vinther, et al Nature Usage Restrictions With credit assigned 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.