144885 20260418110655.0 doi 10.1080/08912963.2024.2367558 sideral 139593 ART-2025-139593 eng Martin, Gabriel M. New metatherians from Collon Cura Formation at Cerro Zeballos (Middle Miocene), Chubut province, Argentina 2025 Access copy available to the general public Unrestricted High latitude metatherians from the Middle Miocene of Patagonia (Argentina and Chile) are only known from medium-sized Sparassodonta, and undescribed taxa collected in several fossil localities of Collon Cura (Argentina) and Río Frías (Chile) Formations, although the latter has several species reported and mostly recognised for the slightly older Santa Cruz Formation. In this contribution we describe five new genera and six new species of metatherians from Collon Cura Formation at Cerro Zeballos, Chubut province (Argentina), based on 11 specimens that notably increased the diversity of Collon Cura Formation. The specimens were assigned to the orders Paucituberculata (Palaeothentoidea), Sparassodonta (Hathliacynidae), and Polydolopimorphia (Argyrolagidae), and are taxa of small size, including the smallest palaeothentoids known to date. Also, the Palaeothentoidea of Cerro Zeballos are amongst the youngest of the superfamily in Patagonia. The new specimens described herein show morphological differences with other metatherian associations already known, probably related to adaptive changes coincident with the Middle Miocene Climatic Transition and the beginning of a faunal turnover. info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 1.3 2024 PALEONTOLOGY 36 / 57 = 0.632 2024 Q3 T2 0.563 2024 Agricultural and Biological Sciences (miscellaneous) 2024 Q1 3.8 2024 info:eu-repo/semantics/article info:eu-repo/semantics/submittedVersion Novo, Nelson M. González Ruiz, Laureano R. Tejedor, Marcelo F. Universidad de Zaragoza (orcid)0000-0003-3465-673X 2000 655 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Paleontología 37, 5 (2025), 1185-1202 Hist. Biol Historical Biology 0891-2963 18070763 http://zaguan.unizar.es/record/144885/files/texto_completo.pdf Preprint 719335 http://zaguan.unizar.es/record/144885/files/texto_completo.jpg?subformat=icon icon Preprint oai:zaguan.unizar.es:144885 articulos driver 2026-04-18-11:05:05 ARTICLE