Ctenospondylus
 Ctenospondylus (comb vertebra) was a pelycosaur that was about 3 meters (10 feet) long. It is known only from the 'Seymouran' Land Vertebrate Faunachron which is equivalent to the upper part of the Artinskian stage and the lowermost Kungurian stage of the Early Permian. Its fossils were found in the U.S. states of Ohio and Texas. It was a carnivore and preyed upon animals close to its size.