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 Synthliboramphus Brandt, 1837
             Synthliboramphus hypoleucus (Xántus de Vesey, 1860) - Xantus's murrelet
               Synthliboramphus hypoleucus hypoleucus (Xántus de Vesey, 1860) - Xantus's murrelet