<i>Plexus ricei</i> (IMAGE) University of California - Riverside Caption Plexus ricei was a broadly curving tube that resided on the Ediacaran seafloor. Individuals range in size from 5 to 80 cm long and 5 to 20 mm wide, and are comprised of two main components: a rigid median tubular structure and a fragile outer tubular wall. Letters and arrows point to the fossil. Credit Droser Lab, UC Riverside. Usage Restrictions None 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.