<==o †Ergilornithidae
   |?- †Proergilornis minor
   |--o †Ergilornis
   |  |-- †E. rapidus
   |  `-- †E. minor
   `--o †Amphipelargus
      |?- ?†A. majori
      |?- ?†A. maraghanus
      |?- ?†A. cracrafti
      |-- †A. ukrainus
      `-- †A. orientalis


Reference(s):

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.