| A (2 species) |
| Angelosaurus - Early Permian |
| Archaeothyris - Late Carboniferous, 306 Ma |
| B (0 species) |
| C (4 species) |
| Casea - Early Permian |
| Cotylorhynchus - Kungurian, 279.5-272 Ma |
| Ctenorhachis - Early Permian, Artinskian |
| Ctenospondylus - Early Permian Artinskian-Kungurian |
| D (2 species) |
| Dimacrodon - Lower Permian |
| Dimetrodon - Cisuralian, 295-272 Ma |
| E (2 species) |
| Ennatosaurus - 265-254 Ma |
| Eothyris - Early Permian,[1] Artinskian |
| F (0 species) |
| G (0 species) |
| H (1 species) |
| Haptodus - Late Carboniferous - Early Permian, 299-296.4 Ma |
| I (1 species) |
| Ianthasaurus - Late Carboniferous, 302 Ma |
| J (0 species) |
| K (0 species) |
| L (0 species) |
| M (2 species) |
| Macromerion - Late Carboniferous 304.2-299 Ma |
| Mycterosaurus - Early Permian |
| N (1 species) |
| Nitosaurus - Unavailable |
| O (3 species) |
| Oedaleops - Early Permian |
| Ophiacodon - Late Carboniferous to Early Permian 306-280 Ma |
| Oromycter - Early Permian 290.1-268 Ma |
| P (1 species) |
| Palaeohatteria - Early Permian, Sakmarian |
| Q (0 species) |
| R (0 species) |
| S (3 species) |
| Secodontosaurus - Cisuralian, 285-272.3 Ma |
| Sphenacodon - Pennsylvanian to Cisuralian, 300-280 Ma |
| Stereorhachis - Late Carboniferous |
| T (0 species) |
| U (0 species) |
| V (3 species) |
| Varanodon - Early Permian, 271 Ma |
| Varanops - Early Permian, 279.5-272.5 Ma |
| Varanosaurus - Early Permian, 280 Ma |
| W (0 species) |
| X (0 species) |
| Y (0 species) |
| Z (0 species) |