Class [Mammalia] Linnaeus, 1758 - mammals
Ref: G.B. Corbet & J.E. Hill, 1991 [inferred name]; Count: [*] 21o;132f;1061g;4316s; ‡1f;5g;38s
   Order Rodentia Bowdich, 1821 - rodents
  Ref: G.B. Corbet & J.E. Hill, 1991: 136; Count: [*] 29f;399g;1788s; ‡1g;16s
     Family Caviidae Fischer de Waldheim, 1817 - cavies and Patagonian "hares"
    Ref: G.B. Corbet & J.E. Hill, 1991: 201; Count: [*] 5g;17s
       Genus Microcavia Gervais & Ameghino, 1880 - mountain cavies
      Ref: G.B. Corbet & J.E. Hill, 1991: 201; Count: [*] 3s
         Microcavia niata (Thomas, 1898) - Andean mountain cavy
        Ref: G.B. Corbet & J.E. Hill, 1991: 201; Count: -