After Olson, 1985, Feduccia, 1980, 1996, and Clarke, Norell & Dashzeveg, 2005
<==o †Ergilornithioidea [Eogruidae Wetmore, 1934 sensu Clarke, Norell & Dashzeveg, 2005] |--o †Geranoididae | |-- †Geranoididae genera et species indet. | |-- †Eogeranoides campivagus | |?- ?†Geranodornis aenigma | |-- †Geranoides jepseni | |--o †Palaeophasianus | | |-- †P. meleagroides | | `-- †P. incompletus | `--o †Paragrus | |-- †P. prentici | `-- †P. shufeldti `--+--o †Eogruidae Wetmore, 1934 | |-- †Sonogrus gregalis Kurochkin, 1981 | `--o †Eogrus Wetmore, 1932 | |-- †E. aeola Wetmore, 1932 | |-- †E. crudus Kurochkin, 1981 | |-- †E. turanicus Bendukidze, 1971 | `?- †E. wetmorei Brodkorb, 1967 `--o †Ergilornithidae |?- †Proergilornis minor |--o †Ergilornis Kozlova, 1960 | |-- †E. rapidus | `-- †E. minor `--o †Amphipelargus [Urmiornis Harrison, 1981] |?- ?†A. majori Lydekker, 1891 [treated as ciconiid by Louchart, Vignaud, Likius, Brunet & White, 2005] |?- ?†A. maraghanus |?- ?†A. cracrafti |-- †A. ukrainus `-- †A. orientalis
Reference(s):
- Clarke, J. A., Norell, M. A. & Dashzeveg, D., 2005: New avian remains from the Eocene of Mongolia and the phylogenetic position of the Eogruidae (Aves, Gruoidea).
–American Museum Novitates: #3494, pp. 1-17 - Feduccia, A., 1980: The Age of Birds.
–Harvard University Press, Cambridge, Massachusetts & London, England, 1980, IX-196 - Feduccia, A., 1996: The Origin and Evolution of Birds.
–Yale University Press, New Haven, 1996, x-420 - Olson, S. L., 1985: The fossil record of birds. 79-239.
in Farner, D., King, J. & Parkes, K. (eds.), 1985: Avian Biology. vol VIII.
–Academic Press, New York. 1985.