A5034080723- Evolution and Paleontology Studies
- Bat Biology and Ecology Studies
- Primate Behavior and Ecology
- Wildlife Ecology and Conservation
- Pleistocene-Era Hominins and Archaeology
- Paleontology and Evolutionary Biology
- Fish biology, ecology, and behavior
- Amphibian and Reptile Biology
- Fish Ecology and Management Studies
- Ichthyology and Marine Biology
- Morphological variations and asymmetry
- Plant Diversity and Evolution
- Scarabaeidae Beetle Taxonomy and Biogeography
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Historical Studies in Science
- History of Science and Natural History
- Marine animal studies overview
- Environmental and Cultural Studies in Latin America and Beyond
- Animal Ecology and Behavior Studies
- Comparative Animal Anatomy Studies
- Genomics and Phylogenetic Studies
Fundación Ciencias Exactas y Naturales
2021-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2016-2024
University of Buenos Aires
2020-2024
Centro Científico Tecnológico - San Juan
2023
Instituto de Ecología
2021
Universidad Nacional de La Plata
2021
Centro Científico Tecnológico - Mendoza
2019-2020
Institut Català de Paleontologia Miquel Crusafont
2014-2015
Universitat Autònoma de Barcelona
2015
Abstract Phylogenetic relationships among sloths (Folivora) have been extensively studied in the past few decades using maximum parsimony approaches. Recently, Bayesian phylogenetic methods also began to be employed for this task, with advances data partitioning and tip-dating analyses leading exciting new possibilities morphological phylogenetics. In context, we assembled largest set ever applied reassessed their phylogeny divergence times, evaluating alternative models of dating a...
Se presenta una breve visión histórica del descubrimiento, estudio, interpretación y repercusión popular de la especie Megatherium americanum Cuvier, 1796 (Mammalia, Xenarthra, Megatheriidae), principalmente dos esqueletos montados en España desde antiguo. El ejemplar exhibido el Museo Ciencias Naturales Valencia (España), que forma parte colección traída por Rodrigo Botet 1898 Argentina, representa uno los especímenes más completos emblemáticos se han recuperado esta megafauna sudamericana...
Glossotherium phoenesis sp. nov. from the late Pleistocene of intertropical Brazil is described and compared with robustum tropicorum. Compared to these two species, main differences occur in shape nasal region pterygoids, proportionate narrowing skull, length arrangement tooth rows, degree projection form mandibular symphysis, height at various points along dentary, proportions radius, among others described. Clear well-preserved skulls new species are interpreted as representing sexual...
Fossil remains of extinct terrestrial sloths have been discovered in numerous localities throughout the Americas, but knowledge these animals poor tropical latitudes comparison with austral ones. Even where Pliocene mylodontine are known from North and South America, well-preserved craniodental extremely rare, hindering reliable assessment their taxonomic assignment phylogenetic affinities. Here, new Simomylodon uccasamamensis, latest Miocene–Pliocene Bolivian Altiplano, described compared...
Abstract The phylogeny of mylodontid sloths has recently been the subject multiple studies. Contrasting hypotheses have proposed, especially for relationships among late Miocene–Pleistocene mylodontines and lestodontines. In this paper, a new detailed phylogenetic analysis is conducted, after adding characters taxa previously unexplored from point view. New features derived postcranial skeletal anatomy are added to previous studies based on craniodental evidence. way, current reappraisal...
Abstract Sloth morphological evolution has been widely studied qualitatively, with comparative anatomy and morpho‐functional approaches, or through quantitative assessments of variation using morphometrics. Only recently, however, have folivoran disparity evolutionary rates begun to be evaluated discrete character data. Nonetheless, patterns in separate partitions not investigated, neither the relative influence of, on one hand, phylogeny, other, dietary locomotory adaptations sloths. Here...
Abstract The Huayquerian Stage of the South American chronostratigraphic scheme (named for Huayquerías del Este, Argentina) was originally based on a poorly known mammal association six taxa from Formation. We studied geology, age and fauna Neogene sequence in this area, including Huayquerías, Tunuyán Bajada Grande formations. comprises monotonous succession synorogenic epiclastic sediments deposited under arid to semi‐arid conditions. Zircon U–Pb dates 10 tuffaceous levels (7.2–1.6 Ma)...
Abstract We describe the new frog Telmatobius achachila sp. nov. from late Middle to earliest Late Miocene of Achiri, based on a partial skeleton found at 3960 m above sealevel in Bolivian Altiplano. This skeleton, attributed male adult, constitutes first documented fossil record speciose living genus , endemic Andean Cordillera and Phylogenetic analysis confirms species as being part crown group, diverging both later than T. verrucosus group earlier bolivianus marmoratus macrostomus groups....
New remains of a relatively plesiomorphic nothrotheriid sloth have been recovered from upper Miocene-aged deposits near the village Achiri in Altiplano Bolivia. The new specimens appear allied to other middle and late Miocene Argentina Bolivia that assigned pseudo-genus 'Xyophorus'. 'Xyophorus' has not previously recognised as distinct genus because paucity material it encompasses. specimens, however, include well-preserved squamosal with attached auditory region an isolated astragalus....
Extinct scelidotheriine sloths are among the most peculiar fossil mammals from South America. In recent decades, external cranial anatomy of Pleistocene scelidotheres such as Scelidotherium, Catonyx and Valgipes has been subject numerous studies, but their endocranial remains almost completely unknown. Today, computed tomographic (CT) scanning methodologies permit exploration previously inaccessible anatomical areas through a non-destructive process. For this reason, we undertook an analysis...
Abstract Sexual dimorphism (SD) is extremely common in species that have reproductive roles segregated into separate sexes, and it has been recognized several mammalian lineages, both extant extinct. low to moderate living sloths, but had a more important role for extinct sloth taxa. The presence of SD sloths was first suggested at the end 19th century now commonly advocated as possible explanation high intraspecific variation many species. In this paper, we report Simomylodon...
The late Pleistocene mylodontine sloth Glossotherium wegneri (Spillmann, 1931) (Interandean region, Ecuador) has been assigned to Owen, 1839 and Oreomylodon Hoffstetter, 1949 (the latter ranked as a subgenus or genus), synonymized with G. robustum (Owen, 1842). However, the phylogenetic comparative analyses conducted here, which include previously undescribed remains, strongly suggest specific distinction for that there is little, if any, support generic subgeneric Oreomylodon. Among...
Abstract Extinct terrestrial sloths are common elements of the late Cenozoic South American fossil record. Among them, Mylodontinae species were particularly abundant in Americas throughout Pleistocene epoch, and their anatomy is relatively well known. In contrast, less information available from Neogene record localities at low latitudes, with an additional considerable bias favour craniodental rather than postcranial remains. this contribution, we provide comparative descriptions several...
Dermal ossifications (osteoderms, dermal ossicles, osteoscutes) appear independently in various tetrapod lineages. In mammals, however, are only present some members of Xenarthra. This clade includes Cingulata (armadillos and their relatives), Pilosa, including Vermilingua (anteaters) Folivora (sloths). extant xenarthrans, osteoderms invariably cingulates whereas they absent pilosans. Among extinct sloths, a limited number taxa possessed ossifications. Records mummified skins ground sloths...
Pronothrotherium typicum is a late Miocene–early Pliocene (Huayquerian–Chapadmalalan SALMA) nothrotheriid sloth known from the Catamarca Province of northwestern Argentina. one four genera relatively complete skeletal material, but unlike other three, osteology has not been formally described. The present study provides first detailed description and illustration cranial anatomy Pronothrotherium, based largely on nearly complete, subadult skull P. collections Field Museum (Chicago, Illinois,...
Fossil remains of extinct mylodontine sloths have been discovered in numerous localities throughout the American supercontinent, but knowledge them is still mainly centered on Pleistocene forms rather than their Neogene relatives. In this contribution, previously unpublished cranial and postcranial materials herein ascribed to Glossotherium chapadmalense (Kraglievich), coming from Pliocene Chapadmalal Formation (Province Buenos Aires, Argentina), are presented. These described compared with...