 Fossils of Dimetrodon are known from the United States ( Texas , Oklahoma , New Mexico , Arizona , Utah and Ohio ) and Germany , areas that were part of the supercontinent Euramerica during the Early Permian . Within the United States , almost all material attributed to Dimetrodon has come from three geological groups in north @-@ central Texas and south @-@ central Oklahoma : the Clear Fork Group , the Wichita Group , and the Pearce River Group . Most fossil finds are part of lowland ecosystems which , during the Permian , would have been vast wetlands . In particular , the Red Beds of Texas is an area of great diversity of fossil tetrapods , or four @-@ limbed vertebrates . In addition to Dimetrodon , the most common tetrapods in the Red Beds and throughout Early Permian deposits in the southwestern United States , are the amphibians Archeria , Diplocaulus , Eryops , and Trimerorhachis , the reptiliomorph Seymouria , the reptile Captorhinus , and the synapsids Ophiacodon and Edaphosaurus . These tetrapods made up a group of animals that paleontologist Everett C. Olson called the " Permo @-@ Carboniferous chronofauna , " a fauna that dominated the continental Euramerican ecosystem for several million years . Based on the geology of deposits like the Red Beds , the fauna is thought to have inhabited a well @-@ vegetated lowland deltaic ecosystem . 
