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Butt-breathing sea predator that roamed the ocean 500 million years ago discovered

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Mosura fentoni, a 506 million - year-old arthropod, was found in Canada 's Royal Ontario Museum .

It was only about the size of a human finger and had long gills on its rear.

The fossils are so well preserved that they include intricate details of the species' biology.

They suggest that these early arthropods were more diverse than previously thought.

He was awarded the Master's Excellence Scholarship to study at Cardiff University where he completed a master's degree in international journalism. He also has a second master's degree in biodiversity, evolution and conservation in action from Middlesex University London . When he isn't writing news, Patrick investigates the sale of human remains. You must confirm your public display name before commenting Please logout and then login again, you will then be prompted to enter your display name..