Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family Caviidae Fischer de Waldheim, 1817 - cavies and Patagonian "hares"
         Subfamily Caviinae Fischer de Waldheim, 1817
           Genus Microcavia Gervais & Ameghino, 1880 - mountain cavies
             1 Microcavia australis (I. Geoffroy & d'Orbigny, 1833) - southern mountain cavy
             2 Microcavia niata (Thomas, 1898) - Andean mountain cavy
             3 Microcavia shiptoni (Thomas, 1925)