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Ctenospondylus was a pelycosaur that was about 3 meters (10 feet) long. It lived from Latest Carboniferous to Early Permian. It was a carnivore and it must have eaten other vertebrates close to its own size. Ctenospondylus had a long tail, short back spines, and a very deep yet narrow skull with massive jaws that had sharp teeth. It belonged to the family called Sphenacodontidae, and it was related to Dimetrodon. A species has been found in Ohio, along with Dimetrodon, Edaphosaurus, Ophiacodon, and Eryops, according to the latest Fossils of Ohio book.
