| Adilophontes(noun, america, mammal, oligocene) |
| Aetiocetus(noun, america, mammal, oligocene) |
| Agnotocastor(noun, america, mammal, oligocene) |
| Agriochoerus(noun, america, mammal, oligocene) |
| Archaeocyon(noun, america, mammal, oligocene) |
| Caedocyon(noun, america, mammal, oligocene) |
| Chonecetus(noun, america, mammal, oligocene) |
| Cornwallius(noun, america, mammal, oligocene) |
| Diceratherium(noun, america, mammal, oligocene) |
| Dinaelurus(noun, america, mammal, oligocene) |
| Drassonax(noun, america, mammal, oligocene) |
| Ectopocynus(noun, america, mammal, oligocene) |
| Ekgmowechashala(noun, america, mammal, oligocene) |
| Gustafsonia(noun, america, mammal, oligocene) |
| Hypertragulus(noun, america, mammal, oligocene) |
| Kentriodon(noun, america, mammal, oligocene) |
| Leptomeryx(noun, america, mammal, oligocene) |
| Merychyus(noun, america, mammal, oligocene) |
| Merycochoerus(noun, america, mammal, oligocene) |
| Merycoides(noun, america, mammal, oligocene) |