Dimetrodon

Dimetrodon was a carnivorous mammal-like reptile, or a synapsid during the Permian era

dimetrodon fossil

Facts

Dimetrodon was a pelycasaur, a type of synapsid. It was a predator and ironically, It ate another creature that also had a sailback called Edaphosaurus. 

Trivia

• dimetrodon is often mistaken to be a dinosaur even though lived before them