[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
     Order Anseriformes Wagler, 1831 - waterfowl and screamers
       Family Anatidae Vigors, 1825 - ducks, geese, swans
         Genus Somateria Leach, 1819
           1 Somateria mollissima (Linnaeus, 1758) - common eider
           2 Somateria spectabilis (Linnaeus, 1758) - king eider