Class Mammalia Linnaeus, 1758 - mammals
Count: 29o;11f;21g; ‡1f
   Subclass Theria Parker & Haswell, 1897
  Count: 28o;9f;21g; ‡1f
     Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
    Count: -
       Family Hippopotamidae Gray, 1821 - hippopotamuses
      Count: [*†*] 2g;2s;5ss; ‡3s; †1s [30 Apr 2021]
         Genus Hexaprotodon Falconer & Cautley, 1836 [monotypic]
        Count: [*†*] 1s;2ss; ‡1s; †1s [30 Apr 2021]
           Hexaprotodon liberiensis (Morton, 1849) - pygmy hippopotamus see Choeropsis liberiensis (Morton, 1844)
          Count: [*] 2ss [30 Apr 2021]
             1 [Hexaprotodon liberiensis liberiensis] Morton, 1849 see Choeropsis liberiensis liberiensis
            Count: -
             2 Hexaprotodon liberiensis heslopi Corbet, 1969 see Choeropsis liberiensis heslopi
            Count: -