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 Calidridinae
             Genus Calidris [Merrem], 1804
               Calidris canutus (Linnaeus, 1758) - red knot
                 1 Calidris canutus canutus (Linnaeus, 1758)
                 2 Calidris canutus piersmai Tomkovich, 2001
                 3 Calidris canutus rogersi (Mathews, 1913)
                 4 Calidris canutus roselaari Tomkovich, 1990
                 5 Calidris canutus rufa (Wilson, 1813)
                 6 Calidris canutus islandica (Linnaeus, 1767)