Class Mammalia Linnaeus, 1758 - mammals
Count: [*] 26o;133f;1112g;4545s;7ss; ‡3f;23g;88s; †1g;9s
   Order Rodentia Bowdich, 1821 - rodents
  Count: [*] 28f;427g;1970s; ‡1f;16g;48s; †1g;4s
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
    Count: [*] 17f;57g;208s; ‡1f;11g;24s
       Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
      Count: [*] 17f;57g;208s; ‡1f;11g;24s
         Family Myocastoridae Ameghino, 1902
        Count: [*] 1g;1s
           Family Myocastoridae Ameghino, 1902
          Count: [*] 1g;1s
             Genus Myocastor Kerr, 1792 - nutria
            Count: [*] 1s
               1 Myocastor coypus (Molina, 1782) R. Kerr, 1792 - coypu
              Count: -