Ergilornithidae is an extinct family of large, flightless birds related to modern ostriches. It was formerly regarded as Ergilornithinae, a subfamily of Eogruidae,Kurochkin, E.N. 1976. A survey of the Paleogene birds of Asia. Smithsonian Contributions to Paleobiology 27:75-86.Kurochkin, E.N. 1981. New representatives and evolution of two archaic gruiform families in Eurasia. Transactions of the Soviet-Mongolian Paleontologial Expedition 15:59-85. but more recently as a family.
Taxonomy †Ergilornithidae †Ergilornis †Ergilornis rapidus †Ergilornis minor (Synonym/s - "Proergilornis") †Amphipelargus †Amphipelargus majori †Amphipelargus cracrafti †An unnamed species possibly within this genus. †Urmiornis †Urmiornis brodkorbi †Urmiornis dzabghanensis †Urmiornis maraghanus †Urmiornis orientalis †Urmiornis ukrainus
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