Prehistoric 'sea monster' had more legs than thought

March 12, 2015 1:31 PM

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Prehistoric 'sea monster' had more legs than thought

An illustration of the anomalocaridid (Aegirocassis benmoulae), a giant filter feeder that fed on plankton and lived in the Early Ordovician about 480 million years ago. The animal measured about 7 feet in length. (Marianne Collins, ArtofFact)

A 480-million-year-old fossil is giving paleontologists new insights into a sea monster-like creature called an anomalocaridid, which is an ancestor of modern-day arthropods such as lobsters and scorpions, a new study finds.

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