Classification of MacFadden et al. 1993

Or. Rodentia Bowdich 1821 [rodent]
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Subor. Caviomorpha Wood and Patterson 1955 [caviomorph]
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Fm. Caviidae Gray 1821
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G. †Caviodon Ameghino 1885
Fm. Hydrochoeridae Gill 1872
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G. †Chapalmatherium Ameghino 1908
Or. †Notoungulata Roth 1903 [notoungulate]
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Fm. †Mesotheriidae Alston 1876
Fm. †Toxodontidae Ameghino 1889
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G. †Posnanskytherium Liendo Lazarte 1943
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Posnanskytherium desaguaderoi Liendo Lazarte 1943
Or. †Litopterna Ameghino 1889
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Fm. †Macraucheniidae Ameghino 1889
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G. †Promacrauchenia Ameghino 1904
Or. Xenarthra Cope 1889 [edentate]
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Subor. Cingulata Illiger 1811
Or. Edentata Cuvier 1798
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Subor. Xenarthra Cope 1889 [edentate]
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Infraor. Pilosa Flower 1883
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Fm. †Megatheriidae Gray 1821
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G. †Proscelidodon Bordas 1935
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Proscelidodon patrius Ameghino 1888
Fm. †Mylodontidae Ameghino 1889
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G. †Glossotherium Owen 1840
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Glossotherium chapadmalensis Kraglievich 1925
Subfm. †Megatheriinae Gill 1872
Subfm. †Mylodontinae Gill 1872
Fm. Cingulata Illiger 1811
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Fm. †Glyptodontidae Burmeister 1879 [glyptodon]
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G. †Paraglyptodon Castellanos 1932
G. †Plohophorus Ameghino 1887
Fm. †Pampatheriidae Paula Couto 1954
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G. †Plaina Castellanos 1927