First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica

Autores
O'Gorman, José Patricio; Coria, R.A.; Reguero, Marcelo Alfredo; Mörs, T.; Cardenas, M.; López, Guillermo Marcos; Chornogusbsky, L.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Elasmosaurid plesiosaurs remains are frequently collected across the Marambio Group (Santonian-Danian), Antarctica. Notwithstanding, finding of informative cranial material is extremely rare. A new specimen (MLP 15-I-7-6), from the Cape Lamb Member of the Snow Hill Island Formation (lower Maastrichtian) in Vega Island (Fig. 1.A, B) allows studying the cranial anatomy of Antarctic non-aristonectine elasmosaurids. The preserved parts of the specimen comprises the braincase, the squamosal arch and the posterior half of the palate, all enclose in a single sandstone concretion and associated with cervical, dorsal and caudal vertebrae, and fragmentary girdles and propodials (Fig. 1C). The elongated vertebral centra indicate that MLP 15-I-7-6 is not an aristonectine elasmosaurid. However it shows two features previously recorded only in the aristonectine elasmosaurids Aristonectes quiriquinensis and A. zealandiensis and therefore, considered synapomorphics for that clade (Otero et al., 2014, 2016): absence of posterior interpterygoid, and the presence of a posterior plate-like extension of the pterygoid (Fig. 2, 3). This suggests that such features could not be exclusive of the aristonectine clade. This new record is important because it shows, for the first time, differences between the skull of non-aristonectine elasmosaurids from the Weddellian Province (i.e. Patagonia, Western Antarctica and New Zealand) and those from the Northern Hemisphere. The authors thank to Dirección Nacional del Antártico and the Instituto Antártico Argentino, project: PICTO 2010-0093 (M.R.) and support of the Fuerza Aérea Argentina (Base Marambio, Dotación 46°).
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Elasmosaurid plesiosaurs
new specimen
cranial anatomy
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/181901

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spelling First cranial remains of a non-aristonectine elasmosaurid plesiosaur from AntarcticaPrimer material craneano de un plesiosaurio elásmosáurido no-aristonectino de AntártidaO'Gorman, José PatricioCoria, R.A.Reguero, Marcelo AlfredoMörs, T.Cardenas, M.López, Guillermo MarcosChornogusbsky, L.Ciencias NaturalesPaleontologíaElasmosaurid plesiosaursnew specimencranial anatomyElasmosaurid plesiosaurs remains are frequently collected across the Marambio Group (Santonian-Danian), Antarctica. Notwithstanding, finding of informative cranial material is extremely rare. A new specimen (MLP 15-I-7-6), from the Cape Lamb Member of the Snow Hill Island Formation (lower Maastrichtian) in Vega Island (Fig. 1.A, B) allows studying the cranial anatomy of Antarctic non-aristonectine elasmosaurids. The preserved parts of the specimen comprises the braincase, the squamosal arch and the posterior half of the palate, all enclose in a single sandstone concretion and associated with cervical, dorsal and caudal vertebrae, and fragmentary girdles and propodials (Fig. 1C). The elongated vertebral centra indicate that MLP 15-I-7-6 is not an aristonectine elasmosaurid. However it shows two features previously recorded only in the aristonectine elasmosaurids Aristonectes quiriquinensis and A. zealandiensis and therefore, considered synapomorphics for that clade (Otero et al., 2014, 2016): absence of posterior interpterygoid, and the presence of a posterior plate-like extension of the pterygoid (Fig. 2, 3). This suggests that such features could not be exclusive of the aristonectine clade. This new record is important because it shows, for the first time, differences between the skull of non-aristonectine elasmosaurids from the Weddellian Province (i.e. Patagonia, Western Antarctica and New Zealand) and those from the Northern Hemisphere. The authors thank to Dirección Nacional del Antártico and the Instituto Antártico Argentino, project: PICTO 2010-0093 (M.R.) and support of the Fuerza Aérea Argentina (Base Marambio, Dotación 46°).Facultad de Ciencias Naturales y Museo2017-10info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdf620-623http://sedici.unlp.edu.ar/handle/10915/181901enginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:49:38Zoai:sedici.unlp.edu.ar:10915/181901Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:49:39.096SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
Primer material craneano de un plesiosaurio elásmosáurido no-aristonectino de Antártida
title First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
spellingShingle First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
O'Gorman, José Patricio
Ciencias Naturales
Paleontología
Elasmosaurid plesiosaurs
new specimen
cranial anatomy
title_short First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
title_full First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
title_fullStr First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
title_full_unstemmed First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
title_sort First cranial remains of a non-aristonectine elasmosaurid plesiosaur from Antarctica
dc.creator.none.fl_str_mv O'Gorman, José Patricio
Coria, R.A.
Reguero, Marcelo Alfredo
Mörs, T.
Cardenas, M.
López, Guillermo Marcos
Chornogusbsky, L.
author O'Gorman, José Patricio
author_facet O'Gorman, José Patricio
Coria, R.A.
Reguero, Marcelo Alfredo
Mörs, T.
Cardenas, M.
López, Guillermo Marcos
Chornogusbsky, L.
author_role author
author2 Coria, R.A.
Reguero, Marcelo Alfredo
Mörs, T.
Cardenas, M.
López, Guillermo Marcos
Chornogusbsky, L.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Elasmosaurid plesiosaurs
new specimen
cranial anatomy
topic Ciencias Naturales
Paleontología
Elasmosaurid plesiosaurs
new specimen
cranial anatomy
dc.description.none.fl_txt_mv Elasmosaurid plesiosaurs remains are frequently collected across the Marambio Group (Santonian-Danian), Antarctica. Notwithstanding, finding of informative cranial material is extremely rare. A new specimen (MLP 15-I-7-6), from the Cape Lamb Member of the Snow Hill Island Formation (lower Maastrichtian) in Vega Island (Fig. 1.A, B) allows studying the cranial anatomy of Antarctic non-aristonectine elasmosaurids. The preserved parts of the specimen comprises the braincase, the squamosal arch and the posterior half of the palate, all enclose in a single sandstone concretion and associated with cervical, dorsal and caudal vertebrae, and fragmentary girdles and propodials (Fig. 1C). The elongated vertebral centra indicate that MLP 15-I-7-6 is not an aristonectine elasmosaurid. However it shows two features previously recorded only in the aristonectine elasmosaurids Aristonectes quiriquinensis and A. zealandiensis and therefore, considered synapomorphics for that clade (Otero et al., 2014, 2016): absence of posterior interpterygoid, and the presence of a posterior plate-like extension of the pterygoid (Fig. 2, 3). This suggests that such features could not be exclusive of the aristonectine clade. This new record is important because it shows, for the first time, differences between the skull of non-aristonectine elasmosaurids from the Weddellian Province (i.e. Patagonia, Western Antarctica and New Zealand) and those from the Northern Hemisphere. The authors thank to Dirección Nacional del Antártico and the Instituto Antártico Argentino, project: PICTO 2010-0093 (M.R.) and support of the Fuerza Aérea Argentina (Base Marambio, Dotación 46°).
Facultad de Ciencias Naturales y Museo
description Elasmosaurid plesiosaurs remains are frequently collected across the Marambio Group (Santonian-Danian), Antarctica. Notwithstanding, finding of informative cranial material is extremely rare. A new specimen (MLP 15-I-7-6), from the Cape Lamb Member of the Snow Hill Island Formation (lower Maastrichtian) in Vega Island (Fig. 1.A, B) allows studying the cranial anatomy of Antarctic non-aristonectine elasmosaurids. The preserved parts of the specimen comprises the braincase, the squamosal arch and the posterior half of the palate, all enclose in a single sandstone concretion and associated with cervical, dorsal and caudal vertebrae, and fragmentary girdles and propodials (Fig. 1C). The elongated vertebral centra indicate that MLP 15-I-7-6 is not an aristonectine elasmosaurid. However it shows two features previously recorded only in the aristonectine elasmosaurids Aristonectes quiriquinensis and A. zealandiensis and therefore, considered synapomorphics for that clade (Otero et al., 2014, 2016): absence of posterior interpterygoid, and the presence of a posterior plate-like extension of the pterygoid (Fig. 2, 3). This suggests that such features could not be exclusive of the aristonectine clade. This new record is important because it shows, for the first time, differences between the skull of non-aristonectine elasmosaurids from the Weddellian Province (i.e. Patagonia, Western Antarctica and New Zealand) and those from the Northern Hemisphere. The authors thank to Dirección Nacional del Antártico and the Instituto Antártico Argentino, project: PICTO 2010-0093 (M.R.) and support of the Fuerza Aérea Argentina (Base Marambio, Dotación 46°).
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