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Ctenospondylus, ("comb vertebra") was a pelycosaur that was about 3 meters (10 feet) long. It lived from Latest Carboniferous to Early Permian. It has been found in Ohio and Texas. 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. Because of its large size, it was probably the apex predator in its environment, and may have competed with other creatures like Dimetrodon for food. 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.
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