Trilobite (image) University of Bristol Share Print E-Mail Caption A fossil trilobite with its complex eye. These ancient animals were inferred to have minimally possessed four opsins, like many modern arthropods, and should have therefore been able to see colors. Credit University of Bristol Usage Restrictions None 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.