Mosura fentoni lived in what is now Canada during the Cambrian period, approximately 506 million years ago. Life reconstruction of Mosura fentoni. Image credit: Danielle Dufault, Royal Ontario Museum. Mosura fentoni was about the size of your index finger and had three eyes, spiny jointed claws, a circular mouth lined with teeth and a body with swimming flaps along its sides. These traits show it to be part of Radiodonta, a group of the earliest diverging...
