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dc.contributor.authorTalevi, Marianella-
dc.contributor.authorFernández, Marta S.-
dc.date.accessioned2020-06-03T16:31:28Z-
dc.date.available2020-06-03T16:31:28Z-
dc.date.issued2014-
dc.identifier.urihttps://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume-
dc.identifier.urihttps://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217-
dc.language.isoenes_ES
dc.relation.ispartof4th International Paleontological Congresses_ES
dc.titleAn unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarcticaes_ES
dc.typeObjeto de conferenciaes_ES
dc.rights.licensehttps://creativecommons.org/licenses/by-nc-sa/4.0/es_ES
dc.description.filiationFil: Talevi, Marianella. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationFil: Fernández, Marta S. Universidad Nacional de La Plata. Museo de La Plata. División Paleontología de Vertebrados. Buenos Aires, Argentina.es_ES
dc.description.filiationFil: Talevi, Marianella. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.es_ES
dc.description.filiationFil: Fernández, Marta S. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.es_ES
dc.subject.keywordPlesiosaurses_ES
dc.subject.keywordAntarcticaes_ES
dc.subject.keywordInternational Paleontological Congresses_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.description.resumenThe structure of tissues is generally not preserved in fossils because soft tissues of the vertebrate body usually have no potential to fossilize. However, the inorganic components of bone preserve the spatial orientation of organic components such as osteocyte lacunae, vascular canals, and collagen fibers. Here we examined ribs of two plesiosaurs recovered from the Maastrichtian (Late Cretaceous) of Antarctic Penisula. The primary bone tissue shows dense, longitudinally oriented fibres organized into bundles instead of typical periosteal bone. These fibre bundles are diamond- shaped when cut exactly perpendicular and are surrounded by a distinct sheath. This structural organization is similar to ossified tendons found in ornithopod dinosaurs (e.g., hadrosaurs) and birds, and in cervical ribs in sauropod dinosaurs. In the ossified tendons of dinosaurs the nature of the primary bone matrix indicates that these structures mainly originated through direct mineralization (metaplasia) of tendinous structures. However, as far as we know, this type of histological organization has never been observed in tetrapod dorsal ribs. We hypothesized that this structural organization of the elasmosaurid ribs may have some biomechanical advantage in the retention of the rib curvature and in resistance against crushing. Testing of this hypothesis requires further expand the samples and biomechanical analyses.es_ES
dc.type.subtypeResumenes_ES
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