Classification of Billet 2011
Or. †Notoungulata Roth 1903 [notoungulate]
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Subor. †Toxodontia Ameghino 1887
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Fm. †Homalodotheriidae Gregory 1910
Fm. †Leontiniidae Ameghino 1894
Fm. †Toxodontidae Ameghino 1889
Subor. †Typotheria Zittel 1892
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Fm. †Hegetotheriidae Ameghino 1894
Fm. †Interatheriidae Ameghino 1887
Fm. †Mesotheriidae Alston 1876