[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 Charadriformes see Order Charadriiformes Huxley, 1867
       Family Stercorariidae Gray, 1870 - skuas
         1 Genus Catharacta Brünnich, 1764 see Genus Stercorarius Brisson, 1760
         2 Genus Stercorarius Brisson, 1760