Microscopic Animal Fossils (IMAGE) Uppsala University Caption From left; the oldest known pterobranch hemichordate; teeth from a priapulid, a sediment dwelling predatory worm; the carapace of a tiny arthropod. Credit Slater, Willman, Budd and Peel Usage Restrictions May only be published in connection to reports about research by Slater, Willman, Budd and Peel. 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.