Living Fossil Platynereis dumerilii (image) European Molecular Biology Laboratory Caption The larvae of marine ragworm Platynereis dumerilii have the simplest eyes that exist. They resemble the first eyes that developed in animal evolution and allow the larvae to navigate guided by light. Credit EMBL Usage Restrictions EMBL press and picture releases may be freely reprinted and distributed via print and electronic media. Text, photographs and graphics are copyrighted by EMBL. They may be freely reprinted and distributed in conjunction with this news story, provided that proper attribution to authors, photographers and designers is made. 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.