Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Order Artiodactyla Owen, 1848 - even-toed ungulates
see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
Family Hippopotamidae Gray, 1821 - hippopotamuses
Genus Hippopotamus Linnaeus, 1758 [monotypic] - hippopotamus
Hippopotamus amphibius Linnaeus, 1758 - hippopotamus
1 [Hippopotamus amphibius amphibius] Linnaeus, 1758
2 Hippopotamus amphibius capensis Desmoulins, 1825
3 Hippopotamus amphibius kiboko Heller, 1914