Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family Echimyidae Gray, 1825 - spiny rats
         Subfamily Echimyinae Gray, 1825
           Genus Isothrix Wagner, 1845 - toros
             1 Isothrix bistriata Wagner, 1845
             2 Isothrix pagurus Wagner, 1845