Invalid subtaxa: Hippopotamus iravaticus Noetling 1897 [nomen dubium], Selenida McKenna and Bell 1997 [invalid subgroup]
Full reference: R. Owen. 1848. Description of teeth and portions of jaws of two extinct Anthracotherioid quadrupeds (Hyopotamus vectianus and Hyop. bovinus) discovered by the Marchioness of Hastings in the Eocene deposits on the NW coast of the Isle of Wight: with an attempt to develope Cuvier's idea of the Classification of Pachyderms by the number of their toes. Quarterly Journal of the Geological Society of London 4:103-141
Parent taxon: Euungulata according to R. J. Asher and K. M. Helgen 2010
Sister taxa: Arctocyonia, Dinocerata
Subtaxa: Aralotherium, Astrapotheroidea, Cambaytheriidae, Danjiangia, Equina, Hyracotheriidae, Lambdotheriidae, Lophodontomorpha, Menodontidae, Mesolambdolophus, Rhinocerotida, Skopaiolophus, Tapiromorpha, Titanotheriomorpha, Triplopidae
Ecology: ground dwelling browser-grazer