Radiocarbon dates of fossil record assigned to mylodontids (Xenarthra - Folivora) found in Cueva del Milodón, Chile

The dermal armor of mylodontid sloths (Mammalia, Xenarthra) from Cueva del Milodón (Última Esperanza, Chile)

“…These patterns are in accordance with what Branco (1906) described for another fragment of skin recovered from the CdM and housed in the Berlin Museum. A rosette was also recognized in the cephalic osteoderms of one specimen of Glossotherium robustum , indicating this kind of arrangement could be present in other mylodontid taxa. In thin sections, it was possible to recognize and describe in detail the anatomical features of the ossicles and their development, complementing and expanding previous descriptions. Several hypotheses on biological roles (protection against predation and/or intraspecific aggression, and thermal insulation) can be proposed to address the presence of these features among mylodontines, but further evidence is required for their assessment. Dermal armor appears to be a synapomorphy of Mylodontini, recorded since the late Miocene‐early Pliocene to the Upper Pleistocene (see Pérez et al, 2021), and evolved as a convergence with cingulates, but also showing more complexity in spatial arrangement (and perhaps in function) than previously accepted.…”

“…MLP 94‐VIII‐10‐28 consists of an extremely dehydrated and hard skin portion that, since its discovery, has lost much of its hair. The skin was previously sampled several times for various analyses (e.g., radiocarbon dates, fungal decay assessment, see Pérez et al, 2021), and has remained on exhibit for almost a century (Pérez et al, 2018). Due to its uniqueness and fragility, only restricted manipulation was allowed for this study.…”

Vertebrados Del Cuaternario Continental De Uruguay: Cronología Y Ambientes

“…Por otro lado, es interesante destacar la posible persistencia en el Holoceno Temprano en esta área, de algunos mamíferos extinguidos de gran y mediana talla, ya que han sido reportados restos preservados en sedimentos datados en ese rango (Ubilla et al, 2018). sin embargo, es necesario obtener edades-taxón para disponer de un mayor sustento empírico de este proceso, teniendo en cuenta que algunos estudios recientes realizados en otras áreas de América del sur no lo descartan (Pérez et al, 2021;Gasparini y Tonni, 2022).…”

Typupiscis lujanensis (Ameghino 1874), assignment to Ancistrus cirrhosus (Valenciennes 1836), the Ameghino-Burmeister rivalry and the beginning of the scientific photography in the Plata.

“…Ameghino, que como bien diría Mayet (1911) "il résistait mal à l'entraînement de son imagination" y a su "fiebre de crear nuevas especies", al decir de Burmeister, se precipito a nominar al nuevo animal misterio-so a partir de solo un osteodermo de dudoso origen (Pérez et al, 2018), como Neomylodon listai (Ameghino, 1898c). La historia del Neomylodon se encuentra abundantemente documentada (ver Ameghino, 1898a;Basaldúa, 1899;Hauthal et al, 1899;Moreno, 1899;Nordenskiold, 1900;Gusinde, 1921;Smith-Woodward, 1900;Lehemann-Nitsche, 1902;Roth, 1902;Torcelli, 1935, OC y CC carta 711;Emperaire, 1954;Bird, 1993;Martinicic, 1996;Bell 2002;Pérez et al, 2018; entre otros), estudios posteriores permitieron acotar la edad de sus restos entre 15.000 y 16.000 años AP (Tonni et al, 2003, Toledo, 2009, 2017Pérez et al, 2021).…”