Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Mustelidae Batsch, 1788 - weasels, badgers, skunks, and otters
           Subfamily Mustelinae Batsch, 1788 - weasels
             Genus Lyncodon Gervais, 1845 [monotypic] - Patagonian weasel
               Lyncodon patagonicus (de Blainville, 1842) - Patagonian weasel
                 Lyncodon patagonicus thomasi Cabrera, 1928