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] Passeriformes Linnaeus, 1758
         oscines see Suborder Oscines
           Passerida - passeridans see Parvorder Passerida (C. Linnaeus, 1758) Sibley et al., 1988
             Passeroidea
               Family Parulidae Wetmore et al., 1947 - New World warblers
                 Genus Oporornis S.F. Baird, 1858
                   1 Oporornis formosus (A. Wilson, 1811) - kentucky warbler
                   2 Oporornis agilis (A. Wilson, 1812) - connecticut warbler
                   3 Oporornis philadelphia (A. Wilson, 1810) - mourning warbler
                   4 Oporornis tolmiei (J.K. Townsend, 1839) - macgillivray's warbler