Classification of Verzi et al. 2014
Fm. Echimyidae Gray 1825 [spiny rat]
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G. †Adelphomys Ameghino 1887
G. †Deseadomys Wood and Patterson 1959
G. †Dicolpomys Winge 1887
G. †Eodelphomys Frailey and Campbell, Jr 2004
G. †Eumysops Ameghino
G. †Maruchito Vucetich et al. 1993
G. †Pampamys Verzi et al. 1995
G. †Paradelphomys Patterson and Pascual 1968
G. †Stichomys Ameghino 1887
G. †Theridomysops Vucetich 1995
G. †Xylechimys Patterson and Pascual 1968
Fm. Abrocomidae Miller and Gidley 1918 [chinchilla rat]
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G. †Abrocoma Waterhouse 1837
G. †Spaniomys Ameghino 1877
Subfm. Octodontinae Waterhouse 1839
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G. †Abalosia Reig and Quintana 1991
G. †Acarechimys Patterson 1965
G. †Acaremys Ameghino 1887
G. †Caviocricetus Vucetich and Verzi 1996
G. †Neophanomys Rovereto 1914
G. †Pithanotomys Ameghino 1887
G. †Sciamys Ameghino 1887
Subfm. Ctenomyinae Lesson 1842
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G. †Actenomys Burmeister 1888
G. †Chasichimys Pascual 1967
G. †Chasicomys Pascual 1967
G. †Eucelophorus Ameghino 1908
G. †Praectenomys Villarroel 1975
G. †Protadelphomys Ameghino 1902
G. †Sallamys Hoffstetter and Lavocat 1970
G. †Willidewu Vucetich and Verzi 1991
G. †Xenodontomys Kraglievich 1927