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A tibiotarsus (MACN-A 12195) collected by Ameghino in the Sarmiento Formation (Eocene–lower Miocene) outcropping in the ‘Río Chico locality’ (Chubut Province, Argentina) assigned to  Diogenornis  (Rheiformes, Palaeognathae), and a second limb bone (MPEF-PV 1411) from early Miocene levels of the Sarmiento Formation in Bryn Gwyn (Chubut Province, Argentina) assigned to a bird that resembles  Diogenornis , were re-examined here. After a thorough comparison, we established that MACN-A 12195 corresponds to an indeterminate Palaeognathae morphologically close to Rheidae, Struthionidae, and Casuariidae, whereas MPEF-PV 1411 belongs to a Sphenisciformes, probably  Palaeospheniscus . The presence of  Diogenornis  outside of Brazil cannot be confirmed, and therefore, its biochron and distribution area should be still restricted to the early Eocene of Itaboraí (Brazil).

About the alleged record of the Rheidae Diogenornis in the Cenozoic of Argentina: new interpretations