Insights on the oldest terror bird (Aves, Phorusrhacidae) from the Eocene of Argentina

ABSTRACT

Phorusrhacidae, commonly known as terror birds, constitutes a group of Cariamiformes that lived mainly in South America during the Cenozoic. The oldest record is represented by an isolated distal end of tibiotarsus (MLP-PV 75-II-3-22) discovered in the Lutetian (middle Eocene) levels of the Sarmiento Formation exposed in the Cañadón Vaca locality (Chubut Province, Argentina). Despite being frequently cited as the oldest specimen of Phorusrhacidae, this specimen has never been figured or comprehensively described. Motivated by this gap and recognising the significance of this finding, we conducted a detailed comparison of the tibiotarsus MLP-PV 75-II-3-22 with those of other species, assigning it to an indeterminate species of Psilopterinae with an estimated body mass of approximately 5 kg. Furthermore, following the identification of numerous tooth marks on the distal surface, we hypothesised that this small phorusrhacid may have been subjected to an attack or scavenging event by a small-to-medium predator, such as Nemolestes spalacotherinus, a hypercarnivorous marsupial previously recorded in the Cañadón Vaca assemblage.

GRAPHICAL ABSTRACT

KEYWORDS:

• Psilopterus
• Psilopterinae
• Vacan
• Lutetian
• Eocene
• Cenozoic

Acknowledgments

The authors wish to thank the curators Martín de los Reyes and Yanina Herrera (MLP) for the access to the material under study. CAH specially thanks to Dr. Javier N. Gelfo for his comments on the Vacan fauna. This is a contribution for the projects PIP 0096 and PID N955. WJ thanks ANII and PEDECIBA Biología.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the Consejo Nacional de Investigaciones Científicas y Técnicas [PIP0096]; Universidad Nacional de La Plata [PID N955].