Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Charadriiformes Huxley, 1867 - shorebirds, gulls, auks
           Suborder Lari Sharpe, 1891 - gulls and allies
             Family Stercorariidae Gray, 1870 - skuas
               Genus Catharacta Brünnich, 1764 see Genus Stercorarius Brisson, 1760
                 Catharacta antarctica (Lesson, 1831) - southern skua see Stercorarius antarcticus (Lesson, 1831)
                 Catharacta chilensis (Bonaparte, 1857) - Chilean skua see Stercorarius chilensis Bonaparte, 1857
                 Catharacta maccormicki (Saunders, 1893) - South Polar skua see Stercorarius maccormicki Saunders, 1893
                 Catharacta skua Brünnich, 1764 - great skua see Stercorarius skua (Brünnich, 1764)