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 Ortalis Merrem, 1786
               Ortalis vetula (Wagler, 1830) - plain chachalaca
                 1 Ortalis vetula mccallii Baird, 1858 see Ortalis vetula mccalli Baird, 1858
                 2 Ortalis vetula vetulaᵀ (Wagler, 1830)
                 3 Ortalis vetula pallidiventris Ridgway, 1887
                 4 Ortalis vetula intermedia Peters, 1913
                 5 Ortalis vetula deschauenseei Bond, 1936