Family
Hippopotamidae Gray, 1821
Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Superclass | Tetrapoda |
| Class | Mammalia |
| Order | Artiodactyla |
| Suborder | Ruminantia |
| Family | Bovidae |
| Camelidae | |
| Cervidae | |
| Hippopotamidae | |
| Genus | Hippopotamus |
| Family | Suidae |