Classification of Degrange et al. 2012

Fm. Rheidae Bonaparte 1849 [rhea]
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G. †Opisthodactylus Ameghino 1891
Fm. Falconidae Vigors 1824
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G. †Badiostes
G. †Thegornis
Or. Gruiformes Bonaparte 1854
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G. †Anisolornis Ameghino 1891
Or. Anseriformes Wagler 1831 [waterfowl]
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G. †Brontornis Moreno and Mercerat 1891
G. †Eoneornis
Fm. Anhingidae Ridgway 1887 [darter]
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G. †Liptornis
Fm. Threskiornithidae Richmond 1917 [ibis]
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G. †Protibis Ameghino 1891