Classification of Arnal and Vucetich 2015
Superfm. Octodontoidea Waterhouse 1839
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G. †Acarechimys Patterson 1965
Fm. †Acaremyidae Wood 1949
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G. †Acaremys Ameghino 1887
G. †Galileomys Vucetich and Kramarz 2003
G. †Platypittamys Wood 1949
G. †Adelphomys Ameghino 1887
G. †Caviocricetus Vucetich and Verzi 1996
G. †Changquin Vucetich et al. 2014
G. †Chasichimys Pascual 1967
Fm. Ctenomyidae Lesson 1842
G. †Deseadomys Wood and Patterson 1959
G. †Draconomys Vucetich et al. 2010
G. †Dudumus Arnal et al. 2014
G. †Eodelphomys Frailey and Campbell, Jr 2004
G. †Eoespina Frailey and Campbell, Jr 2004
G. †Eosachacui Frailey and Campbell, Jr 2004
G. †Eosallamys Frailey and Campbell, Jr 2004
G. †Ethelomys Vucetich et al. 2015
G. †Eumysops Ameghino
G. Kannabateomys Jentink 1891
G. †Leucokephalos Vucetich et al. 2015
G. †Llitun Vucetich et al. 2015
G. †Migraveramus Patterson and Wood 1982
G. Myocastor Kerr 1782
G. †Neophanomys Rovereto 1914
Fm. Octodontidae Waterhouse 1839
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G. Octodontomys Palmer 1903
G. Octomys Thomas 1920 [viscacha rat]
G. †Pithanotomys Ameghino 1887
G. †Plataeomys Ameghino 1881
G. †Paulacoutomys Vucetich et al. 1993
G. †Plesiacarechimys Vucetich and Vieytes 2006
G. Proechimys Allen 1899 [spiny rat]
G. †Prospaniomys Ameghino 1902
G. †Protacaremys Ameghino 1902
G. †Sallamys Hoffstetter and Lavocat 1970
G. †Spaniomys Ameghino 1877
G. †Stichomys Ameghino 1887
G. †Xylechimys Patterson and Pascual 1968
Superfm. Chinchilloidea Bennett 1833
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G. †Eoviscaccia Vucetich 1989
G. †Garridomys Kramarz et al. 2013
Superfm. Erethizontoidea Bonaparte 1845
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G. †Eosteiromys Ameghino 1902
G. †Steiromys Ameghino 1887
Unr. Caviomorpha Wood and Patterson 1955 [caviomorph]
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G. †Cachiyacuy Antoine et al. 2011
G. †Canaanimys Antoine et al. 2011