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 Somateria Leach, 1819
               Somateria mollissima (Linnaeus, 1758) - common eider
                 1 Somateria mollissima v-nigra Gray, 1856 see Somateria mollissima v-nigrum Bonaparte & G.R. Gray, 1855
                 2 Somateria mollissima borealis (Brehm, 1824)
                 3 Somateria mollissima sedentaria Snyder, 1941
                 4 Somateria mollissima dresseri Sharpe, 1871
                 5 Somateria mollissima faroeensis Brehm, 1831
                 6 Somateria mollissima mollissima (Linnaeus, 1758) - common eider