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