Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Chinchillidae Bennett, 1833 - viscachas and chinchillas
       Genus Lagidium Meyen, 1833 - mountain viscachas
         1 Lagidium peruanum Meyen, 1833 - northern mountain viscacha
         2 Lagidium viscacia (Molina, 1782) - southern mountain viscacha
         3 Lagidium wolffsohni (Thomas, 1907) - Wolffsohn's mountain viscacha