Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
       [Order] Anseriformes Wagler, 1831 - waterfowl and screamers
         Family Anatidae Vigors, 1825 - ducks, geese, swans
           Subfamily Anatinae Vigors, 1825 - pond ducks
             Genus Mergus Linnaeus, 1758
               1 ‡Mergus australis Hombron & Jacquinot, 1841 - Auckland Island merganser
               2 Mergus octosetaceus Vieillot, 1817 - Brazilian merganser
               3 Mergus merganser Linnaeus, 1758 - goosander
               4 Mergus serrator Linnaeus, 1758 - red-breasted merganser
               5 Mergus squamatus Gould, 1864 - scaly-sided merganser