Pleistoanser bravardi Agnolín, 2006 (Aves), a taxonomic journey from Anseriformes to Psittaciformes

Pleistoanser bravardi Agnolín, 2006, was described as a tadornine anseriform from the Lower–Mid Pleistocene of southern Buenos Aires Province, Argentina. The genus and species were based on a partial associated forelimb (i.e. coracoid, humerus, radio, ulna, carpometacarpus) and was described as a small and very apomorphic duck. A restudy of the original specimen, and a reconstruction of the holotype humerus, allowed us to recognise that P. bravardi was not an anseriform bird but clearly belonged to Psittaciformes. The humerus shows strong anatomical similarities to the extant genus Cyanoliseus, resulting in the new combination Cyanoliseus bravardi (Agnolín, 2006) nov. comb. With the reclassification of this species, there would be a total of four species of the genus Cyanoliseus described for the Pleistocene of the southern of South America, indicating that the clade of these desert-dwelling parrots was more speciose in past times.