An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica
Fil: Talevi, Marianella. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina. Fil: Fernández, Marta S. Universidad Nacional de La Plata. Museo de La Plata. División Paleontología de Vertebrados. Buenos Aires, Argentina. Fil: Talevi, Mariane...
Main Authors: | , |
---|---|
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217 https://hdl.handle.net/20.500.12049/5217 https://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume |
id |
ftunivnrionegro:oai:rid.unrn.edu.ar:20.500.12049/5217 |
---|---|
record_format |
openpolar |
spelling |
ftunivnrionegro:oai:rid.unrn.edu.ar:20.500.12049/5217 2023-05-15T13:44:25+02:00 An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica Talevi, Marianella Fernández, Marta S. 2014 application/pdf https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217 https://hdl.handle.net/20.500.12049/5217 https://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume en eng 4th International Paleontological Congress https://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/4.0/ CC-BY-NC-SA Plesiosaurs Antarctica International Paleontological Congress 2014 ftunivnrionegro https://doi.org/20.500.12049/5217 2023-01-24T14:47:47Z Fil: Talevi, Marianella. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina. Fil: Fernández, Marta S. Universidad Nacional de La Plata. Museo de La Plata. División Paleontología de Vertebrados. Buenos Aires, Argentina. Fil: Talevi, Marianella. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. Fil: Fernández, Marta S. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. The 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. Other/Unknown Material Antarc* Antarctic Antarctica RID-UnRN - Repositorio Institucional Digital Universidad Nacional de Río Negro Antarctic Argentina The Rib ENVELOPE(-55.748,-55.748,52.983,52.983) The Ribs ENVELOPE(-55.781,-55.781,52.750,52.750) |
institution |
Open Polar |
collection |
RID-UnRN - Repositorio Institucional Digital Universidad Nacional de Río Negro |
op_collection_id |
ftunivnrionegro |
language |
English |
topic |
Plesiosaurs Antarctica International Paleontological Congress |
spellingShingle |
Plesiosaurs Antarctica International Paleontological Congress Talevi, Marianella Fernández, Marta S. An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
topic_facet |
Plesiosaurs Antarctica International Paleontological Congress |
description |
Fil: Talevi, Marianella. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina. Fil: Fernández, Marta S. Universidad Nacional de La Plata. Museo de La Plata. División Paleontología de Vertebrados. Buenos Aires, Argentina. Fil: Talevi, Marianella. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. Fil: Fernández, Marta S. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. The 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. |
author |
Talevi, Marianella Fernández, Marta S. |
author_facet |
Talevi, Marianella Fernández, Marta S. |
author_sort |
Talevi, Marianella |
title |
An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
title_short |
An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
title_full |
An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
title_fullStr |
An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
title_full_unstemmed |
An unusual periosteal tissue in the ribs of two plesiosaurs (Sauropterygia: Plesiosauroidea) from the Upper Cretaceous of Antarctica |
title_sort |
unusual periosteal tissue in the ribs of two plesiosaurs (sauropterygia: plesiosauroidea) from the upper cretaceous of antarctica |
publishDate |
2014 |
url |
https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217 https://hdl.handle.net/20.500.12049/5217 https://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume |
long_lat |
ENVELOPE(-55.748,-55.748,52.983,52.983) ENVELOPE(-55.781,-55.781,52.750,52.750) |
geographic |
Antarctic Argentina The Rib The Ribs |
geographic_facet |
Antarctic Argentina The Rib The Ribs |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
4th International Paleontological Congress https://www.researchgate.net/publication/286934709_4th_International_Palaeontological_Congress-_Abstract_Volume https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5217 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/20.500.12049/5217 |
_version_ |
1766201478551175168 |