(Apsaravis_ukhaana,(Ichthyornis_dispar,((Gavia_immer,((Anatalavis_oxfordi,(Anas_platyrhynchos,Chauna_torquata)),(Gallinuloides_wyomingensis,(Gallus_gallus,Crax_pauxi)))),(((Apteryx_owenii,Emeus_crassus),(Palaeotis_weigelti,(Struthio_camelus,(Rhea_americana,Dromaius_novaehollandiae)))),(((Crypturellus_undulatus,Tinamus_major),(Nothura_maculosa,Eudromia_elegans)),(FMNH_PA_729_wing,(Lithornis,((Lithornis_celetius_combined,(Lithornis_celetius_holotype,Lithornis_celetius_others)),(Lithornis_vulturinus_MGUH26770,(Lithornis_plebius,((Lithornis_promiscuus_skull,(Lithornis_celetius_postcrania,(Paracathartes_howardae,(Lithornis_promiscuus_holotype,Lithornis_promiscuus_combined)))),(WSGS_U1b_dash_2001,((Pseudocrypturus_cercanaxius,(Calciavis_grandei_holotype,(Calciavis_grandei_referred,FMNH_PA_739))),(Siber_and_Siber,Pseudocrypturus_combined))))))))))))));