Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Passerae see Superorder Passerimorphae Sibley et al., 1988
         Superorder Passerimorphae Sibley et al., 1988
           Order Ciconiiformes Bonaparte, 1854
             Suborder Charadrii Huxley, 1867 - shorebirds see Order Charadriiformes Huxley, 1867
               Infraorder Charadriides Huxley, 1867
                 Parvorder Charadriida see Superfamily Charadrioidea Vigors, 1825
                   Superfamily Laroidea Vigors, 1825
                     Family Laridae Vigors, 1825 - gulls, terns and skimmers
                       Subfamily Larinae Vigors, 1825 - gulls
                         Tribe Sternini Bonaparte, 1838 - terns see Subfamily Sterninae Bonaparte, 1838
                           Genus Gygis Wagler, 1832
                             Gygis alba (Sparrman, 1786) - common white-tern
                               Gygis alba candida (Gmelin, 1789) - common white-tern