Order Ralliformes Reichenbach, 1854 - marsh birds and allies
   Suborder Cariamae (Wagler, 1830) Fürbringer, 1888 - seriemas and allies
     Family †Phorusrhacidae Ameghino, 1899
       Subfamily †Palaeociconiinae P. Brodkorb, 1967
         1 Genus †Andrewsornis Patterson, 1941
         2 Genus †Palaeociconia Moreno & Mercerat
         3 Genus †Andalgalornis Patterson & J.L. Kraglievich