Systematic review of some deseadan (Middle Oligocene) birds described by Ameghino in 1899. Most of the fossil birds described by Ameghino for “Deseadan” (Oligocene) beds are reviewed. The following is concluded: 1) Aminornis excavatus is excluded from the order Gruiformes and is included within the Anseriformes; 2) Teleornis is considered an Anatidae Tadorninae; 3) Loncornis erectus is an indeterminate bird; 4) Riacama caliginea and Smiliornis penetrans are included in the superfamily Cariamoidea; 5) Ciconiopsisantarcticais provisionally considered a valid genus of the family Psilopteridae. Key words: Fossil birds, taxonomy,Oligocene,Argentina.
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