Polychaete worm swimming GIF (image) Marine Biological Laboratory Share Print E-Mail Caption Polychaete worm, Tomopteris, with setae moving on each side of the body in metachronal waves. Credit Sean Colin Usage Restrictions Please use with credit. 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.