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] Strigiformes Wagler, 1830 - owls
         Family Strigidae Vigors, 1825 - owls
           Subfamily Surniinae del Hoyo et al., 2014
             01 Genus Surnia Duméril, 1805 [monotypic]
             02 Genus Glaucidium Boie, 1826
             03 Genus Xenoglaux O'Neill & Graves, 1977 [monotypic]
             04 Genus Micrathene Coues, 1866 [monotypic]
             05 Genus Athene Boie, 1822
             06 Genus Heteroglaux Hume, 1873 [monotypic]
             07 Genus Aegolius Kaup, 1829
             08 Genus Ninox Hodgson, 1837
             09 Genus Uroglaux Mayr, 1937 [monotypic]
             10 Genus ‡?Sceloglaux Kaup, 1848 [monotypic]