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 canicollis (Wagler, 1830) - Chaco chachalaca
                 1 Ortalis canicollis canicollisᵀ (Wagler, 1830)
                 2 Ortalis canicollis pantanalensis Cherrie & Reichenberger, 1921