Amphioxus (Branchiostoma lanceolatum) (image) Marine Biological Laboratory Caption Amphioxus can grow as long as 2.5 inches and are typically found half-burrowed in sand. Credit Hans Hillewaert/Wikimedia Usage Restrictions Please use with proper credit. 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.