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] Caprimulgiformes Ridgway, 1881 - nightjars
         Family Caprimulgidae Vigors, 1825 - nightjars
           Subfamily Chordeilinae - nighthawks
             Genus Chordeiles Swainson, 1831[1832]
               Chordeiles pusillus Gould, 1861 - least nighthawk
                 1 Chordeiles pusillus septentrionalis (Hellmayr, 1908)
                 2 Chordeiles pusillus esmeraldae Zimmer & Phelps, 1947
                 3 Chordeiles pusillus xerophilus Dickerman, 1988
                 4 Chordeiles pusillus novaesi Dickerman, 1988
                 5 Chordeiles pusillus pusillus Gould, 1861
                 6 Chordeiles pusillus saturatus Pinto & Camargo, 1957