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 Mustela Linnaeus, 1758 - weasels, ermines, stoats, minks, ferrets, and polecats
               Mustela frenata Lichtenstein, 1831 - long-tailed weasel
                 Mustela frenata macrophonius (Elliot, 1905)