Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Anseriformes Wagler, 1831 - waterfowl and screamers
           Family Anatidae Vigors, 1825 - ducks, geese, swans
             Subfamily Anatinae Vigors, 1825 - pond ducks
               01 Genus Cyanochen Bonaparte, 1856
               02 Genus Chloephaga Eyton, 1838
               03 Genus Neochen Oberholser, 1918
               04 Genus Alopochen Stejneger, 1885
               05 Genus Tadorna Boie, 1822
               06 Genus Tachyeres Owen, 1875
               07 Genus Plectropterus Stephens, 1824
               08 Genus Cairina Fleming, 1822
               09 Genus Sarkidiornis Eyton, 1838
               10 Genus Pteronetta Salvadori, 1895
               11 Genus Nettapus Brandt, 1836 - green pygmy-goose
               12 Genus Callonetta Delacour, 1936
               13 Genus Aix Boie, 1828
               14 Genus Chenonetta Brandt, 1836 - maned duck
               15 Genus Amazonetta Boetticher, 1929
               16 Genus Hymenolonaimus see Genus Hymenolaimus Gray, 1843
               17 Genus Merganetta Gould, 1842
               18 Genus Salvadorina Rothschild & Hartert, 1894
               19 Genus Anas Linnaeus, 1758 - Pacific black duck
               20 Genus Malacorhynchus Swainson, 1831 - pink-eared duck
               21 Genus Marmaronetta Reichenbach, 1853
               22 Genus ‡Rhodonessa Reichenbach, 1853
               23 Genus Netta Kaup, 1829
               24 Genus Aythya Boie, 1822 - hardhead
               25 Genus Somateria Leach, 1819
               26 Genus Polysticta Eyton, 1836
               27 Genus ‡Camptorynchus see Genus Camptorhynchus Bonaparte, 1838
               28 Genus Histrionicus Lesson, 1828
               29 Genus Clangula Leach, 1819
               30 Genus Melanitta Boie, 1822
               31 Genus Bucephala Baird, 1858
               32 Genus Mergus Linnaeus, 1758
               33 Genus Stictonetta Reichenbach, 1853 - freckled duck
               34 Genus Heteronetta Salvadori, 1865
               35 Genus Oxyura Bonaparte, 1828 - blue-billed duck
               36 Genus Biziura Stephens, 1824 - musk duck
               37 Genus Thalassornis Eyton, 1838