MRS_Iotuba_EJ007A (1).jpg (IMAGE) Durham University Caption Specimen of the Cambrian cage worm Iotuba from the Chengjiang fossil deposit. Credit Credit: Martin R. Smith Usage Restrictions Please credit as below. License Original 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.