Order Anseriformes Wagler, 1831 - waterfowl and screamers
   Suborder Anseres Linnaeus, 1758 - waterfowl
     Family Anatidae Vigors, 1825 - ducks, geese, swans
       01 Subfamily †Eonessinae Wetmore, 1938
       02 Subfamily †Romainvilliinae Lambrecht, 1933
       03 Subfamily Cygninae Vigors - swans see Subfamily Anserinae Vigors, 1825
       04 Subfamily Anserinae Vigors, 1825 - geese
       05 Subfamily Dendrocygninae Reichenbach - tree-ducks
       06 Subfamily Plectropterinae G.R. Gray - spur-winged geese see Subfamily Tadorninae Reichenbach
       07 Subfamily Cereopsinae G.R. Gray - Cape Barren geese see Subfamily Anatinae Vigors, 1825
       08 Subfamily Tadorninae Reichenbach - sheldrakes
       09 Subfamily Anatinae Vigors, 1825 - pond ducks
       10 Subfamily Aythyinae Delacour & Mayr, 1945 - scaups see Subfamily Anatinae Vigors, 1825
       11 Subfamily †Paranyrocinae Miller & Compton, 1939
       12 Subfamily Merginae Bonaparte - sea ducks see Subfamily Anatinae Vigors, 1825
       13 Subfamily Oxyurinae Phillips, 1926 - stiff-tailed ducks see Subfamily Anatinae Vigors, 1825
       14 Subfamily Merganettinae Bonaparte - torrent ducks see Subfamily Anatinae Vigors, 1825
       15 Subfamily Anseranatinae Stejneger, 1885 - pied geese see Family Anseranatidae Sclater, 1880