Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Neoaves Sibley et al. 1988 see Subcohort Neoaves Sibley et al., 1988
       [Order] Charadriiformes Huxley, 1867 - shorebirds, gulls, auks
         Family Laridae Vigors, 1825 - gulls, terns and skimmers
           Subfamily Sterninae Bonaparte, 1838 - terns
             Genus Gygis Wagler, 1832 [monotypic]
               Gygis alba (Sparrman, 1786) - common white-tern
                 1 Gygis alba alba (Sparrman, 1786) - Atlantic white-tern
                 2 Gygis alba candida (Gmelin, 1789) - common white-tern
                 3 Gygis alba microrhyncha Saunders, 1876
                 4 Gygis alba leucopes Holyoak & Thibault, 1976