Mantis Shrimp Using Telson as Shield (VIDEO) University of California - Riverside This video is under embargo. Please login to access this video. Caption A mantis shrimp blocks a blow from a rival using a shield-like tail segment called a telson. Credit Roy Caldwell/UC Berkeley Usage Restrictions With credit to Roy Caldwell, UC Berkeley 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.