A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids
- Autores
- O'gorman, José P.; Talevi, Marianella; Fernández, Marta S.; Coria, Rodolfo Anibal; Moly, Juan J.
- Año de publicación
- 2016
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Fil: O'gorman, Jose P. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.
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. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina.
Fil: Coria, Rodolfo A. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Moly, Juan J. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina.
Fil: O'gorman, Jose P. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología 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.
Fil: Coria, Rodolfo A. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.
Fil: Coria, Rodolfo A. Subsecretaría de Cultura de Neuquén. Museo Carmen Funes. Neuquén, Argentina.
The humerus MLP 12-II-1-1 collected from the upper Campanian Gamma Member of theSnow Hill Island Formation gives new evidence about the moment of appearance of relatively large elasmosaurids in the James Ross Basin. The MLP 12-II-1-1 consists in a single humerus severely weathered. However, a fragment of the anterior margin shows a concave area, which is a feature shared by Vegasaurus molyi O´Gorman, Salgado, Olivero, Marenssi, 2015 and other indeterminate Weddellian elasmosaurids. The paleohistological analysis shows a cortical region with a compact bone, which it is entirely of secondary origin. This area is composed of numerous secondary osteons conforming a dense Haversian bone tissue, reaching the most peripheral region of the cortex. The microstructure of the humerus reveals a very important secondary reconstruction evidenced by the Haversian tissue. This coincides with the general assumption that the number and density of secondary osteons increase as size and age do. The most remarkable feature of MLP 12-II-1-1 is its large size. A preliminary comparison of proportions among other aristonectines and non aristonectines elasmosauridsindicate a size of between 600-650 mm, which is larger than the 440 mm long humerus of the Cenomanian Thalassomedon haningtoni Welles, 1943 that is considered one of the largest elasmosaurids. The specimen MLP 12-II-1-1 has similar size of some aristonectine propodials. These specimens indicate that relatively large elasmosaurids, probably aristonectines, were present in Antarctica at least since the late Campanian. - Materia
-
James Ross Island
Antarctic Elasmosaurids
Late Campanian - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de Río Negro
- OAI Identificador
- oai:rid.unrn.edu.ar:20.500.12049/5229
Ver los metadatos del registro completo
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A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosauridsO'gorman, José P.Talevi, MarianellaFernández, Marta S.Coria, Rodolfo AnibalMoly, Juan J.James Ross IslandAntarctic ElasmosauridsLate CampanianFil: O'gorman, Jose P. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.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. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina.Fil: Coria, Rodolfo A. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.Fil: Moly, Juan J. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina.Fil: O'gorman, Jose P. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología 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.Fil: Coria, Rodolfo A. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.Fil: Coria, Rodolfo A. Subsecretaría de Cultura de Neuquén. Museo Carmen Funes. Neuquén, Argentina.The humerus MLP 12-II-1-1 collected from the upper Campanian Gamma Member of theSnow Hill Island Formation gives new evidence about the moment of appearance of relatively large elasmosaurids in the James Ross Basin. The MLP 12-II-1-1 consists in a single humerus severely weathered. However, a fragment of the anterior margin shows a concave area, which is a feature shared by Vegasaurus molyi O´Gorman, Salgado, Olivero, Marenssi, 2015 and other indeterminate Weddellian elasmosaurids. The paleohistological analysis shows a cortical region with a compact bone, which it is entirely of secondary origin. This area is composed of numerous secondary osteons conforming a dense Haversian bone tissue, reaching the most peripheral region of the cortex. The microstructure of the humerus reveals a very important secondary reconstruction evidenced by the Haversian tissue. This coincides with the general assumption that the number and density of secondary osteons increase as size and age do. The most remarkable feature of MLP 12-II-1-1 is its large size. A preliminary comparison of proportions among other aristonectines and non aristonectines elasmosauridsindicate a size of between 600-650 mm, which is larger than the 440 mm long humerus of the Cenomanian Thalassomedon haningtoni Welles, 1943 that is considered one of the largest elasmosaurids. The specimen MLP 12-II-1-1 has similar size of some aristonectine propodials. These specimens indicate that relatively large elasmosaurids, probably aristonectines, were present in Antarctica at least since the late Campanian.2016info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttps://capa2016.wixsite.com/congresoapa2016/descargashttps://rid.unrn.edu.ar/jspui/handle/20.500.12049/5229eng11° congreso de la Asociación Paleontológica Argentinainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-04T11:13:10Zoai:rid.unrn.edu.ar:20.500.12049/5229instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-04 11:13:10.307RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse |
dc.title.none.fl_str_mv |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
title |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
spellingShingle |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids O'gorman, José P. James Ross Island Antarctic Elasmosaurids Late Campanian |
title_short |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
title_full |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
title_fullStr |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
title_full_unstemmed |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
title_sort |
A late Campanian large-sized elasmosaurid from James Ross Island with comments on the paleohistology of Antarctic elasmosaurids |
dc.creator.none.fl_str_mv |
O'gorman, José P. Talevi, Marianella Fernández, Marta S. Coria, Rodolfo Anibal Moly, Juan J. |
author |
O'gorman, José P. |
author_facet |
O'gorman, José P. Talevi, Marianella Fernández, Marta S. Coria, Rodolfo Anibal Moly, Juan J. |
author_role |
author |
author2 |
Talevi, Marianella Fernández, Marta S. Coria, Rodolfo Anibal Moly, Juan J. |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
James Ross Island Antarctic Elasmosaurids Late Campanian |
topic |
James Ross Island Antarctic Elasmosaurids Late Campanian |
dc.description.none.fl_txt_mv |
Fil: O'gorman, Jose P. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. 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. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina. Fil: Coria, Rodolfo A. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina. Fil: Moly, Juan J. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Unidades de Investigación Anexo Museo. División Paleontología Vertebrados. Buenos Aires, Argentina. Fil: O'gorman, Jose P. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología 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. Fil: Coria, Rodolfo A. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. Fil: Coria, Rodolfo A. Subsecretaría de Cultura de Neuquén. Museo Carmen Funes. Neuquén, Argentina. The humerus MLP 12-II-1-1 collected from the upper Campanian Gamma Member of theSnow Hill Island Formation gives new evidence about the moment of appearance of relatively large elasmosaurids in the James Ross Basin. The MLP 12-II-1-1 consists in a single humerus severely weathered. However, a fragment of the anterior margin shows a concave area, which is a feature shared by Vegasaurus molyi O´Gorman, Salgado, Olivero, Marenssi, 2015 and other indeterminate Weddellian elasmosaurids. The paleohistological analysis shows a cortical region with a compact bone, which it is entirely of secondary origin. This area is composed of numerous secondary osteons conforming a dense Haversian bone tissue, reaching the most peripheral region of the cortex. The microstructure of the humerus reveals a very important secondary reconstruction evidenced by the Haversian tissue. This coincides with the general assumption that the number and density of secondary osteons increase as size and age do. The most remarkable feature of MLP 12-II-1-1 is its large size. A preliminary comparison of proportions among other aristonectines and non aristonectines elasmosauridsindicate a size of between 600-650 mm, which is larger than the 440 mm long humerus of the Cenomanian Thalassomedon haningtoni Welles, 1943 that is considered one of the largest elasmosaurids. The specimen MLP 12-II-1-1 has similar size of some aristonectine propodials. These specimens indicate that relatively large elasmosaurids, probably aristonectines, were present in Antarctica at least since the late Campanian. |
description |
Fil: O'gorman, Jose P. Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 |
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info:eu-repo/semantics/conferenceObject info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
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https://capa2016.wixsite.com/congresoapa2016/descargas https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5229 |
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https://capa2016.wixsite.com/congresoapa2016/descargas https://rid.unrn.edu.ar/jspui/handle/20.500.12049/5229 |
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eng |
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eng |
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11° congreso de la Asociación Paleontológica Argentina |
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