| A (1 species) |
| Agathaumas - Late Cretaceous, 66 Ma |
| B (0 species) |
| C (0 species) |
| D (0 species) |
| E (1 species) |
| Eotriceratops - Late Cretaceous, 68-67.6 Ma |
| 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) |
| Ojoceratops - Late Cretaceous, 68 Ma |
| P (0 species) |
| Q (0 species) |
| R (1 species) |
| Regaliceratops - Late Cretaceous, 68.5-67.5 Ma |
| S (0 species) |
| T (3 species) |
| Titanoceratops - Late Cretaceous, 74.73-73.55 Ma |
| Torosaurus - Late Cretaceous, 68 Ma |
| Triceratops - Late Cretaceous, 68 Ma |
| U (0 species) |
| V (0 species) |
| W (0 species) |
| X (0 species) |
| Y (0 species) |
| Z (0 species) |