| Neoplagiaulacidae(noun, fauna, extinction, rupelian) |
| Notostylopidae(noun, fauna, extinction, rupelian) |
| Oligopithecidae(noun, fauna, extinction, rupelian) |
| Orohippus(noun, eocene, extinction, genus) |
| Oxyaena(noun, eocene, extinction, genus) |
| Pachyaena(noun, eocene, extinction, genus) |
| Palaeocarpilius(noun, fauna, extinction, rupelian) |
| Palaeoglaux(noun, eocene, extinction, genus) |
| Palaeonictis(noun, eocene, extinction, genus) |
| Palaeotherium(noun, eocene, extinction, genus) |
| Paracathartes(noun, eocene, extinction, genus) |
| Paracryptodira(noun, eocene, extinction, genus) |
| Paratylopus(noun, fauna, extinction, rupelian) |
| Parectypodus(noun, eocene, extinction, genus) |
| Paschatherium(noun, eocene, extinction, genus) |
| Patriofelis(noun, eocene, extinction, genus) |
| Pentacrinites(noun, eocene, extinction, genus) |
| Phiomia(noun, fauna, extinction, rupelian) |
| Phymosoma(noun, eocene, extinction, genus) |
| Piceoerpeton(noun, eocene, extinction, genus) |