Mosura Fentoni, 506-Million-Year-Old Predator

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Invertebrate Paleontology

Phys Org

•

Science

Researchers discover new 506-million-year-old predator from Burgess Shale of Canada

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Mosura fentoni was about the size of an index finger and had three eyes, spiny jointed claws, a circular mouth lined with teeth and a body with swimming flaps.

Mosura possessed a feature not seen in any other radiodont: an abdomen-like body region made up of multiple segments at its back end.

The reason for this adaptation remains uncertain, but the researchers postulate it may be related to particular habitat preference or behavioral characteristics of Mosura that required more efficient respiration.

More information: Early evolvability in arthropod tagmosis exemplified by a new radiodont from the Burgess Shale , Royal Society Open Science ( 2025 ). DOI: 10.1098/rsos.242122 Journal information: Royal Society Open Science Provided by Royal Ontario Museum .

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