After McKenna & Bell, 1997

<==o †Notoungulata Roth, 1904
   |?- †Acoelodus
   |?- †Pleurystylops
   |?- †Lophiodonticulus
   |?- †Tonostylops
   |?- †Isotypotherium
   |?- †Epitypotherium
   |?- †Carolodarwinia
   |?- †Ortholophodon
   |?- †Procolpodon
   |?- †Senodon
   |?- †Loxocoelus
   |?- †Pyralophodon
   |?- †Orthogeniops [Orthogenium]
   |?- ?†Pyramidon [nomen dubium?]
   |?- ?†Archaeotypotherium [nomen dubium?]
   |-- †Notioprongonia
   |-- †Toxodontia
   `-- †Typotheria Zittel, 1893

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