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 Alcidae Vigors, 1825 - auks
           Genus Cepphus Pallas, 1769
             Cepphus grylle (Linnaeus, 1758) - black guillemot
               1 Cepphus grylle mandtii (Lichtenstein, 1822)
               2 Cepphus grylle arcticus (Brehm, 1824)
               3 Cepphus grylle islandicus Hørring, 1937
               4 Cepphus grylle faeroeensis Brehm, 1831
               5 Cepphus grylle grylle (Linnaeus, 1758)