Full reference: G. G. Simpson. 1945. The principles of classification and a classification of mammals. Bulletin of the American Museum of Natural History 85:1-350
Parent taxon: Notoungulata according to G. G. Simpson 1967
See also McKenna 1975 and Reguero et al. 2008
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, 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, Typotheria, Typotheroidea, Ultrapithecus robustus
Subtaxa: Eohegetotherium Pseudopachyrucos
Ecology: scansorial herbivore
Distribution:
• Eocene of Argentina (2 collections)
Total: 2 collections including 3 occurrences