Parent taxon: Notoungulata according to G. Billet 2011
See also Ameghino 1894, Gadow 1898, García López and Babot 2015, García López and Powell 2011, McKenna 1975, Reguero and Prevosti 2010, Reguero et al. 2003, Shockey et al. 2009, Simpson 1935, Simpson 1945, Simpson 1967 and Vera 2012
Sister taxa: Acoelodus, Albertogaudryidae, Allalmeia, Archaeogaia, Archaeopithecidae, Archaeoplus, Archaeotypotherium transitum, Brandmayria, Carolodarwinia, Carolodarwinia pyramidentata, Claenodon patagonicus, Degonia sympathica, Edvardocopeia, Edvardocopeia sinuosa, Entelonychia, Epitypotherium cancellatum, Eudiastatus, Eurystephanodon, Hegetotheria, Henricosborniidae, Heterolophodon, Homalodotheria, Isotypotherium, Lophiodonticulus, Lophiodonticulus patagonicus, Lophiodonticulus retroversus, Notioprogonia, Notopithecidae, Notopithecus summus, Notostylopidae, Oldfieldthomasiidae, Orthogenium ameghinoi, Ortholophodon, Pleurystylops, Pleurystylops glebosus, Procolpodon, Procolpodon foratus, Pyramidon, Pyramidon klaatschi, Tonostylops, Tonostylops spissus, Toxodontia, Trimerostephanos ultimus, Typotheroidea, Ultrapithecus robustus
Subtaxa: Campanorcidae Eutrachytheriidae Griphotherion Hegetotheriidae Hemihegetotheriidae Interatheriidae Mesotheriidae Protypotheriidae Typotheriidae Typotherioidea
Ecology: scansorial herbivore