The therapsids include all mammals plus the many mammal-like reptiles, such as Dicynodon and the sabre-toothed gorgonopsids. The therapsids rose to prominence in the Permian to become the most successful land animals of their day. The secret of their success was in their teeth, as therapsids evolved new and better methods of chewing plant and animal food. However, the group took a hammering in the mass extinction at the end of the Permian, and was sidelined for millions of years as the dinosaurs diversified. The therapsids' ultimate successors - mammals - now rule the Earth courtesy of those efficient therapsid teeth and jaws.
Scientific name: Therapsida
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Additional data source: Animal Diversity Web
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