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 Scolopacidae Vigors, 1825 - sandpipers, snipe
           Subfamily Tringinae Gray, 1840 - sandpipers, curlews, phalaropes
             Genus Catoptrophorus Bonaparte, 1827 [monotypic]
               Catoptrophorus semipalmatus (Gmelin, 1789) - willet
                 1 Catoptrophorus semipalmatus inornatus (Brewster, 1887)
                 2 Catoptrophorus semipalmatus semipalmatus (Gmelin, 1789)