Order Artiodactyla Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 637 722 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Hippopotamus Linnaeus 1758 Hippopotamus Linnaeus 1758 , Syst. Nat., 10th ed., Vol. 1: 74 . Type Species: Hippopotamus amphibius Linnaeus 1758 Synonyms: Hippopothamus Boddaert 1785 ; Tetraprotodon Falconer and Cautley 1836 . Species and subspecies: 1 species with 3 subspecies: Species Hippopotamus amphibius Linnaeus 1758 Subspecies Hippopotamus amphibius subsp. amphibius Linnaeus 1758 Subspecies Hippopotamus amphibius subsp. capensis Desmoulins 1825 Subspecies Hippopotamus amphibius subsp. kiboko Heller 1914