Olavius algarvensis (IMAGE) Max Planck Institute for Marine Microbiology Caption The gutless marine worm Olavius algarvensis under the microscope. It is about two centimeters long and only 0.5 milimeters wide, and lives in between the sand grains (shown on photo) next to seagrass beds in the Mediterranean Sea. Credit Rebekka Jahnke / Max Planck Institute for Marine Microbiology Usage Restrictions Only to be used in the context of this publication and citing the correct copyright. 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.