Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Charadriiformes Huxley, 1867 - shorebirds, gulls, auks
                   Suborder Lari Sharpe, 1891 - gulls and allies
                     Family Sternidae Bonaparte, 1838 see Subfamily Sterninae Bonaparte, 1838
                       1 Genus Sterna Linnaeus, 1758
                       2 Genus Hydroprogne Kaup, 1829 see Genus Sterna Linnaeus, 1758
                       3 Genus Gelochelidon Brehm, 1830, nom. nud. see Genus Sterna Linnaeus, 1758
                       4 Genus Phaetusa Wagler, 1832
                       5 Genus Chlidonias Rafinesque, 1822
                       6 Genus Gygis Wagler, 1832
                       7 Genus Anous Stephens, 1826
                       8 Genus Procelsterna Lafresnaye, 1842
                       9 Genus Larosterna Blyth, 1852