Order Anseriformes Wagler, 1831 - waterfowl and screamers
   Suborder Anseres Linnaeus, 1758 - waterfowl
     Family Anatidae Vigors, 1825 - ducks, geese, swans
       Subfamily Cygninae Vigors - swans see Subfamily Anserinae Vigors, 1825
         1 Genus †Cygnopterus Lambrecht, 1931
         2 Genus †Cygnavus Lambrecht, 1931
         3 Genus Cygnus Bechstein, 1803 - mute swan
         4 Genus †Cygnanser Kretzói, 1957
         5 Genus Olor Wagler, 1832 see Genus Cygnus Bechstein, 1803