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 Alcae Sharpe - auks see Superfamily Laroidea Vigors, 1825
                     Family Alcidae Vigors, 1825 - auks
                       01 Genus Uria Brisson, 1760
                       02 Genus Alca Linnaeus, 1758
                       03 Genus Cepphus Pallas, 1769
                       04 Genus Fratercula Brisson, 1760
                       05 Genus Lunda Pallas, 1811 see Genus Fratercula Brisson, 1760
                       06 Genus Cerorhinca Bonaparte, 1828
                       07 Genus Plautus Linnaeus, 1758 see Genus Alle Link, 1806
                       08 Genus Aethia Merrem, 1788
                       09 Genus Cyclorrhynchus Kaup, 1829 see Genus Aethia Merrem, 1788
                       10 Genus Synthliboramphus Brandt, 1837
                       11 Genus Brachyramphus Brandt, 1837
                       12 Genus Ptychoramphus Brandt, 1837
                       13 Genus Endomychura Oberholser, 1899 see Genus Synthliboramphus Brandt, 1837
                       14 Genus ‡Pinguinus Bonnaterre, 1791