Ancient Sea Worms Lived in Tube-Like Houses

Fossils from a 500-million-year-old creature show it occupied vertical structures that jutted up from the sea floor.

Published On 07/07/2016
2:48 PM EDT
Oesia resembled modern acorn worms, scientists say. Credit: Wikimedia Commons/Necrophorus
An artist's impression of Oesia shows the animal in the perforated tube that scientists believe it inhabited. Drawing by Marianne Collins