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
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/5229
Acceder
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spelling 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 Negro2025-09-29T14:29:13Zoai: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:43692025-09-29 14:29:14.185RID-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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dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 11° congreso de la Asociación Paleontológica Argentina
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