An Abelisaurid Humerus from the Bajo de la Carpa Formation (Upper Cretaceous, Santonian), Northern Patagonia, with Comments on Morphological Aspects of the Humerus in Abelisauridae
The Cerro Overo-La Invernada rea (Bajo de la Carpa Formation, Upper Cretaceous, Santonian) in northern Patagonia has yielded abundant fossils of abelisaurid theropods, including cranial, vertebral, pectoral and pelvic remains.However, forelimb bones were unknown.Here, we describe a humerus that exhibits distinctive features that allow its assignment to Abelisauridae, for example, flattened distal condyles, greater tubercle distally located, and humeral head subspherical in proximal view.It also exhibits a noticeable torsion of the distal end.Morphofunctional analysis indicates a substantial capacity for protraction along with a limited capacity for lateromedial movement.In a general aspect, MAU-PV-LI-737 is morphologically intermediate between the more gracile humerus of noasaurids and the robust shape observed in Campanian-Maastrichtian abelisaurid forms.
Authors
- Ariana Paulina‐Carabajal (ORCID: https://orcid.org/0000-0002-7820-4770)
- Javier González-Dionis (ORCID: https://orcid.org/0000-0002-7542-1243)
- Do-Kwon Kim
- Penélope Cruzado‐Caballero (ORCID: https://orcid.org/0000-0002-5819-8254)
- Yuong‐Nam Lee (ORCID: https://orcid.org/0000-0003-1067-6074)
- Ariel H. Méndez (ORCID: https://orcid.org/0000-0003-3291-1565)
- Magalí Cárdenas (ORCID: https://orcid.org/0000-0001-5548-6798)
- Federico Gianechini
- Leonardo Filippi (ORCID: https://orcid.org/0000-0003-0743-8294)
- Alberto Rubio Garrido (ORCID: https://orcid.org/0000-0001-8806-3599)
- Emanuel Seculi-Pereyra
- Lucía Vettorazzi
Institutions
- Namseoul University (KR)
- Seoul National University (KR)
- Universidad de La Laguna (ES)
- Bernardino Rivadavia Natural Sciences Museum (AR)
- University of Argentine Social Museum (AR)
- Centro Científico Tecnológico - San Luis (AR)
- Centro Científico Tecnológico Patagónico (AR)
- Universidad Nacional del Comahue (AR)
- National University of San Luis (AR)
Publication Details
- Journal
- Ameghiniana
- Published
- 2025-10-02
- DOI
- https://doi.org/10.5710/amgh.24.09.2025.3642
- Primary Topic
- Evolution and Paleontology Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Research Foundation
- Consejo Nacional de Investigaciones Científicas y Técnicas
- National Research Foundation of Korea
- Agencia Nacional de Promoción de la Investigación, el Desarrollo Tecnológico y la Innovación