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

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...

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Bibliographic Details
Published in:Historical biology 2023-09, Vol.35 (9), p.1515-1521
Main Authors: Acosta Hospitaleche, Carolina, Picasso, Mariana B.J.
Format: Article
Language:English
Subjects:
Cenozoic
Eocene
Miocene
Palaeognathae
Patagonia
Rheidae
Rheiformes
Sarmiento Formation
South America
Tibiotarsus
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Summary: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).
ISSN:0891-2963
1029-2381
DOI:10.1080/08912963.2022.2098489