Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Infraclass Eutheria Gill, 1872
Magnorder Boreoeutheria Springer & de Jong, 2001
Superorder Euarchontoglires Murphy, Stanyon & O'Brien, 2001
Order Rodentia Bowdich, 1821 - rodents
Suborder Hystricomorpha Brandt, 1855
Infraorder Hystricognathi Tullberg, 1899
Superfamily Chinchilloidea Bennett, 1833
Family Chinchillidae Bennett, 1833 - viscachas and chinchillas