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Animals

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.

July 7, 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