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 Micrathene Coues, 1866 [monotypic]
               Micrathene whitneyi (J.G. Cooper, 1861) - elf owl
                 1 Micrathene whitneyi whitneyi (Cooper, 1861)
                 2 Micrathene whitneyi idonea (Ridgway, 1914)
                 3 Micrathene whitneyi sanfordi (Ridgway, 1914)
                 4 Micrathene whitneyi graysoni Ridgway, 1886