A5034653773- Evolution and Paleontology Studies
- Paleontology and Evolutionary Biology
- Ichthyology and Marine Biology
- Pleistocene-Era Hominins and Archaeology
- Bat Biology and Ecology Studies
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Fish biology, ecology, and behavior
- Marine animal studies overview
- Amphibian and Reptile Biology
- Animal Ecology and Behavior Studies
- Polar Research and Ecology
- Turtle Biology and Conservation
- Marine Biology and Ecology Research
- Primate Behavior and Ecology
- Wildlife Ecology and Conservation
- Cephalopods and Marine Biology
- Morphological variations and asymmetry
- Geological formations and processes
- Space Exploration and Technology
- Genomics and Phylogenetic Studies
- Plant Diversity and Evolution
- Environmental and Cultural Studies in Latin America and Beyond
- History of Science and Natural History
- Geological and Geophysical Studies Worldwide
Universidad Nacional de La Plata
2015-2024
Argentine Antarctic Institute
2014-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2014-2024
Centro Científico Tecnológico - San Juan
2014-2023
Centro Científico Tecnológico - Tucumán
2012-2022
Centro Científico Tecnológico - La Plata
1997-2017
Field Museum of Natural History
2000-2003
University of California, Santa Barbara
2000-2003
Tacoma Community College
2000
Theodore Roosevelt High School
2000
Abstract Cenozoic ectothermic continental tetrapods (amphibians and reptiles) have not been documented previously from Antarctica, in contrast to all other continents. Here we report a fossil ilium an ornamented skull bone that can be attributed the Recent, South American, anuran family Calyptocephalellidae or helmeted frogs, representing first modern amphibian found Antarctica. The two fragments were recovered Eocene, approximately 40 million years old, sediments on Seymour Island,...
Two new fossil mammal localities from the Paleogene of central-western Patagonia are preliminarily described as basis for a possible biochronological unit early Eocene Patagonia, correlated being between two conventional SALMAs, Riochican (older) and Vacan subage Casamayoran SALMA. The mammal-bearing strata belong to Middle Chubut River Volcanic-Pyroclastic Complex (northwestern Province, Argentina), Paleocene-Eocene age. This complex includes variety volcaniclastic, intrusive, pyroclastic,...
The unusual mix of morphological traits displayed by extinct South American native ungulates (SANUs) confounded both Charles Darwin, who first discovered them, and Richard Owen, tried to resolve their relationships. Here we report an almost complete mitochondrial genome for the litoptern Macrauchenia. Our dated phylogenetic tree places Macrauchenia as sister Perissodactyla, but close radiation major lineages within Laurasiatheria. This position is consistent with a divergence estimate ∼66 Ma...
The first collections of Interatheriinae (Interatheriidae, Notoungulata) were created by the brothers Florentino and Carlos Ameghino, based on fossil specimens collected from diverse outcrops Argentina housed at different national institutions. In order to perform a systematic study subfamily, it is essential revise as much possible, but all those that used establish respective species, is, type material. Ameghino never referred collection number species he erected in any his publications;...
Department of Earth Sciences, University California, Riverside, California 92521Duck-billed dinosaurs or hadrosaurs are a very common family ofdinosaurs in the Late Cretaceous North America and Eurasia withrare occurrences South America. Here, we report first hadrosaurrecovered Antarctica from sandstones late Maastrichtian age, VegaIsland, Antarctic Peninsula (Fig. 1) during joint U.S.-Argentinian geo-logical paleontological field expedition to island. This discoverysupports hypothesis...
(2006). The earliest Tertiary therian mammal from South America. Journal of Vertebrate Paleontology: Vol. 26, No. 2, pp. 505-510.
Abstract In contrast to other cartilaginous fishes (Chondrichthyes), the dentition of Holocephali consists six dental plates, four in upper jaw (two vomerines and two palatines) lower (mandibulars). While microstructure holocephalan has been extensively studied extant species, similar analyses fossil taxa are less common. Here, we provide a detailed description interpretation microanatomy histology plates extinct taxon † Ischyodus dolloi Leriche (Chimaeriformes: ‘Edaphodontidae’). The study...
Abstract Penguins are by far the most dominant group of marine vertebrates in Eocene La Meseta Formation (Seymour Island, Antarctica). We analysed penguin fauna recovered there from both a systematic and biostratigraphic point view. have added two new species ( Tonniornis mesetaensis T. minimum ) defined unit, Anthropornis nordenskjoeldi Biozone. This interval strata, easily distinguishable numerous occurrence bones phosphatic brachiopod Lingula , is located nearly 30–35 m below top 145...
Middle Eocene land mammals from La Meseta Formation, Seymour (Marambio) Island are reviewed. A taxonomically diverse fossil land-vertebrate assemblage with small and medium-size has been recovered four localities. The depositional setting is shallow marine most of the mammal-bearing beds in reworked, moderate to high energy subtidal facies. characteristics these not only confirm but also strengthen biogeographical relationships between southern South America (Patagonian Province) Antarctic...