Image (IMAGE) University of Tsukuba Caption Researchers from the University of Tsukuba found that sea urchin larvae exhibited ciliary responses to strong photoirradiation by swimming backward. As ciliary responses are difficult to detect in deuterostomes because they may be masked by more obvious muscular activities, identifying cilia-based responses to light in sea urchins provides key information on the evolution and diversification of light-response systems in macroscopic animals. Credit University of Tsukuba Usage Restrictions Unauthorized use is prohibited 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.