Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
       [Order] Galliformes Temminck, 1820 - fowl
         Family Cracidae Vigors, 1825 - chachalacas, curassows, guans
           Subfamily Penelopinae Bonaparte, 1831 - guans
             Genus Chamaepetes Wagler, 1832
               Chamaepetes goudotii (Lesson, 1828) - sickle-winged guan
                 1 Chamaepetes goudotii goudotiiᵀ (Lesson, 1828)
                 2 Chamaepetes goudotii sanctaemarthae Chapman, 1912
                 3 Chamaepetes goudotii fagani Chubb, 1917
                 4 Chamaepetes goudotii tschudii Taczanowski, 1886
                 5 Chamaepetes goudotii rufiventris (Tschudi, 1843)
                 6 Chamaepetes goudotii subsp. ?