Reptilia Laurenti, 1768
Bathygnathus Leidy, 1853
Ctenospondylus Romer, 1936
Dimetrodon Cope, 1878
Macromerion Fritsch, 1879
Macromerium Lydekker, 1890
Neosaurus Gilmore & Stewart, 1945
Secodontosaurus Romer, 1936
Sphenacodon Marsh, 1878
