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
             Muscicapoidea
               Family Polioptilidae Baird, 1858 - gnatcatchers
                 1 Genus Microbates Sclater & Salvin, 1873
                 2 Genus Ramphocaenus Vieillot, 1819 [monotypic]
                 3 Genus Polioptila P.L. Sclater, 1855