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
             Genus Glaucidium Boie, 1826
               Glaucidium gnoma Wagler, 1832 - mountain pygmy-owl
                 1 Glaucidium gnoma grinnelli Ridgway, 1914
                 2 Glaucidium gnoma swarthi Grinnell, 1913
                 3 Glaucidium gnoma californicum Sclater, 1857
                 4 Glaucidium gnoma pinicola Nelson, 1910
                 5 Glaucidium gnoma hoskinsii Brewster, 1888
                 6 Glaucidium gnoma gnoma Wagler, 1832
                 7 Glaucidium gnoma cobanense Sharpe, 1875