Classification of Cione et al. 2000

Fm. Dinomyidae Peters 1873
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G. †Briaromys Ameghino 1889
G. †Carlesia Kraglievich 1926
G. †Doellomys Alvarez 1947
G. †Eumegamysops Alvarez 1947
G. †Paranamys Kraglievich 1934
G. †Pentastylodon Alvarez 1947
G. †Pentastylomys Kraglievich 1926
G. †Protomegamys Kraglievich 1932
G. †Pseudosigmomys Kraglievich 1931
G. †Tetrastylomys Kraglievich 1926
Fm. Caviidae Gray 1821
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G. †Cardiomys Ameghino 1885
G. †Pliodolichotis Kraglievich 1927
Fm. Hydrochoeridae Gill 1872
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G. †Plexochoerus Ameghino 1886
G. †Palaeotoxodon Ameghino 1904
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Invalid names: Palaeotoxodon protoburmeisteri Ameghino 1887 [nomen dubium]
Subfm. †Interatheriinae Simpson 1945
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G. †Munizia Kraglievich 1931
Fm. Labridae Cuvier 1816
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G. †Protautoga Leidy 1873
Subfm. †Megatheriinae Gill 1872
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G. †Pliomegatherium Kraglievich 1930
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Pliomegatherium lelongi Kraglievich 1930
Subfm. †Mylodontinae Gill 1872
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G. †Prolestodon Kraglievich 1932
G. †Promylodon Ameghino 1883
G. †Ranculcus Ameghino 1891
Fm. Echymyidae Gray 1825 [spiny rat]
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G. †Haplostropha Ameghino 1891
Subfm. †Macraucheniinae Gervais 1855
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G. †Paranauchenia Ameghino 1904
G. †Scalabrinitherium Ameghino 1883
Subfm. †Proterotheriinae Ameghino 1885
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G. †Coelosoma Ameghino 1891
Subfm. †Haplodontheriinae Ameghino 1907
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G. †Pachynodon Burmeister 1891
Fm. Sparidae Cuvier 1817
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G. Chrysophrys Cuvier 1829
Fm. Sciaenidae Cuvier 1828
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G. Pogonias Lacépède 1802
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Pogonias cromis Cope 1869 [black drum]
Subfm. †Toxodontinae Owen 1837
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G. †Eutomodus Ameghino 1889
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Eutomodus elautus Ameghino 1886
Subfm. †Nesodontinae Murray 1866
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G. †Berroia Kraglievich 1931