| A (1 species) |
| Archaeothyris - Late Carboniferous, 306 Ma |
| B (1 species) |
| Baldwinonus - Early Permian |
| C (1 species) |
| Clepsydrops - Carboniferous |
| D (0 species) |
| E (0 species) |
| F (0 species) |
| G (0 species) |
| H (0 species) |
| I (0 species) |
| J (0 species) |
| K (0 species) |
| L (0 species) |
| M (0 species) |
| N (0 species) |
| O (1 species) |
| Ophiacodon - Late Carboniferous to Early Permian 306-280 Ma |
| P (0 species) |
| Q (0 species) |
| R (0 species) |
| S (0 species) |
| T (0 species) |
| U (0 species) |
| V (0 species) |
| W (0 species) |
| X (0 species) |
| Y (0 species) |
| Z (0 species) |