Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Anseriformes Wagler, 1831 - waterfowl and screamers
                   Family Anatidae Vigors, 1825 - ducks, geese, swans
                     Subfamily Anatinae Vigors, 1825 - pond ducks
                       Tribe Mergini see Subfamily Anatinae Vigors, 1825
                         Genus Mergus Linnaeus, 1758
                           1 Mergus albellus Linnaeus, 1758 see Mergellus albellus (Linnaeus, 1758)
                           2 Mergus cucullatus Linnaeus, 1758 see Lophodytes cucullatus (Linnaeus, 1758)
                           3 Mergus merganser Linnaeus, 1758 - goosander
                           4 Mergus serrator Linnaeus, 1758 - red-breasted merganser
                           5 Mergus squamatus Gould, 1864 - scaly-sided merganser
                           6 ‡Mergus australis Hombron & Jacquinot, 1841 - Auckland Island merganser
                           7 Mergus octosetaceus Vieillot, 1817 - Brazilian merganser