Adult acorn worm (Saccoglossus kowalevskii) (IMAGE) Marine Biological Laboratory Caption The acorn worm (Saccoglossus kowalevskii) is an important research organism in evolutionary developmental biology and is collected in Woods Hole. Its eggs are very fragile and they typically don’t develop properly after microinjection. Credit Chris Lowe Usage Restrictions Use with credit 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.