Learn more about the cambrian explosion of animal life in the Boundless open textbook. During the Cambrian period, the most rapid evolution of new animal species occurred, but the cause of this explosion is still unknown.
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Edaphosaurus was a genus of sail-back synapsid, a group of animals that includes mammals and their relatives. It lived from the late Carboniferous to the early Permian. Even though Edaphosaurus resembled a dinosaur, they were not dinosaurs.