Mammalia Linnaeus, 1758 - mammals
Cetartiodactyla Montgelard, Catzeflis & Douzery 1997
see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
Cetancodonta Arnason, Gullberg, Gretarsdottir, Ursing & Janke 2000
Hippopotamoidea Gentry & Hooker 1988 [Boisserie 2007]
Family Hippopotamidae Gray, 1821 - hippopotamuses
Subfamily Hippopotaminae Gray, 1821
Genus Hippopotamus Linnaeus, 1758 - hippopotamus
[ancestor] †}aff.{ Hippopotamus protamphibius Arambourg, 1944
1 †Hippopotamus protamphibius turkanensis Gèze, 1985