Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography
The last twenty million years (Maastrichtian–Santonian) of Southern Hemisphere plesiosaur history is especially well recorded in the Weddellian Province (Patagonia; Western Antarctica and New Zealand). The oldest Late Cretaceous plesiosaurs, two specimens referred to Polycotylidae indet., come from...
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ftarcticportal:oai:generic.eprints.org:2694 2023-12-10T09:38:59+01:00 Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography O'Gorman, José Patricio Otero, Rodrigo Reguero, Marcelo Gasparini, Zulma 2019-09 application/pdf http://library.arcticportal.org/2694/ http://library.arcticportal.org/2694/1/A1903004.pdf en eng Polar Research Institute of China - PRIC http://library.arcticportal.org/2694/1/A1903004.pdf O'Gorman, José Patricio and Otero, Rodrigo and Reguero, Marcelo and Gasparini, Zulma (2019) Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography. Advances in Polar Science, 30 (3). pp. 210-227. Fauna Terrestrial Article PeerReviewed 2019 ftarcticportal 2023-11-15T23:54:41Z The last twenty million years (Maastrichtian–Santonian) of Southern Hemisphere plesiosaur history is especially well recorded in the Weddellian Province (Patagonia; Western Antarctica and New Zealand). The oldest Late Cretaceous plesiosaurs, two specimens referred to Polycotylidae indet., come from the Santonian levels of the Santa Marta Formation, while the oldest elasmosaurids come from the lower Campanian of the same formation. In the lower Maastrichtian of the Snow Hill Island Formation the non-aristonectine elasmosaurid Vegasaurus molyi is recorded together with other non-diagnosable elasmosaurid specimens, but no aristonectines are present. Aristonectines appears in the Antarctic record in the upper Maastrichtian of the López de Bertodano Formation and are represented by Morturneria and cf. Aristonectes. The specimens from the upper Campanian previously referred to Aristonectinae indet. are referred to Elasmosauridae indet., shortening the temporal record of Aristonectinae in Antarctica. Therefore aristonectines appears in the Antarctic record in the upper Maastrichtian of the López de Bertodano Formation and are represented by Morturneria and cf. Aristonectes. The Antarctic Cretaceous elasmosaurids show a paleobiogeographic connection with South America and New Zealand (Weddellian Province). This connection is indicated by the shared presence of the Aristonectinae Kaiwhekea katiki (New Zealand) and Aristonectes (Argentina and Chile). Recent phylogenetic analysis recovered the aristonectines within the Weddellonectia clade, which includes the aristonectines and the non-aristonectines Vegasaurus molyi (Isla Vega, Antarctica); Kawanectes lafquenianum (Argentina); Morenosaurus stocki and Aphrosaurus furlongi (California). Among the Weddellonectia, the aristonectines show a relatively large body size and extremely derived features and probably occupied a trophic niche that differed from the trophic niche of other elasmosaurids. By way of contrast Kawanectes lafquenianum is an extremely small body-sized ... Article in Journal/Newspaper Advances in Polar Science Antarc* Antarctic Antarctica Polar Science Polar Science Snow Hill Island Arctic Portal Library Antarctic The Antarctic Patagonia New Zealand Argentina Hill Island ENVELOPE(76.070,76.070,-69.395,-69.395) Snow Hill Island ENVELOPE(-57.183,-57.183,-64.466,-64.466) isla Vega ENVELOPE(-57.500,-57.500,-63.833,-63.833) Snow Hill ENVELOPE(-57.183,-57.183,-64.466,-64.466) |
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Open Polar |
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Arctic Portal Library |
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ftarcticportal |
language |
English |
topic |
Fauna Terrestrial |
spellingShingle |
Fauna Terrestrial O'Gorman, José Patricio Otero, Rodrigo Reguero, Marcelo Gasparini, Zulma Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
topic_facet |
Fauna Terrestrial |
description |
The last twenty million years (Maastrichtian–Santonian) of Southern Hemisphere plesiosaur history is especially well recorded in the Weddellian Province (Patagonia; Western Antarctica and New Zealand). The oldest Late Cretaceous plesiosaurs, two specimens referred to Polycotylidae indet., come from the Santonian levels of the Santa Marta Formation, while the oldest elasmosaurids come from the lower Campanian of the same formation. In the lower Maastrichtian of the Snow Hill Island Formation the non-aristonectine elasmosaurid Vegasaurus molyi is recorded together with other non-diagnosable elasmosaurid specimens, but no aristonectines are present. Aristonectines appears in the Antarctic record in the upper Maastrichtian of the López de Bertodano Formation and are represented by Morturneria and cf. Aristonectes. The specimens from the upper Campanian previously referred to Aristonectinae indet. are referred to Elasmosauridae indet., shortening the temporal record of Aristonectinae in Antarctica. Therefore aristonectines appears in the Antarctic record in the upper Maastrichtian of the López de Bertodano Formation and are represented by Morturneria and cf. Aristonectes. The Antarctic Cretaceous elasmosaurids show a paleobiogeographic connection with South America and New Zealand (Weddellian Province). This connection is indicated by the shared presence of the Aristonectinae Kaiwhekea katiki (New Zealand) and Aristonectes (Argentina and Chile). Recent phylogenetic analysis recovered the aristonectines within the Weddellonectia clade, which includes the aristonectines and the non-aristonectines Vegasaurus molyi (Isla Vega, Antarctica); Kawanectes lafquenianum (Argentina); Morenosaurus stocki and Aphrosaurus furlongi (California). Among the Weddellonectia, the aristonectines show a relatively large body size and extremely derived features and probably occupied a trophic niche that differed from the trophic niche of other elasmosaurids. By way of contrast Kawanectes lafquenianum is an extremely small body-sized ... |
format |
Article in Journal/Newspaper |
author |
O'Gorman, José Patricio Otero, Rodrigo Reguero, Marcelo Gasparini, Zulma |
author_facet |
O'Gorman, José Patricio Otero, Rodrigo Reguero, Marcelo Gasparini, Zulma |
author_sort |
O'Gorman, José Patricio |
title |
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
title_short |
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
title_full |
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
title_fullStr |
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
title_full_unstemmed |
Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
title_sort |
cretaceous antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography |
publisher |
Polar Research Institute of China - PRIC |
publishDate |
2019 |
url |
http://library.arcticportal.org/2694/ http://library.arcticportal.org/2694/1/A1903004.pdf |
long_lat |
ENVELOPE(76.070,76.070,-69.395,-69.395) ENVELOPE(-57.183,-57.183,-64.466,-64.466) ENVELOPE(-57.500,-57.500,-63.833,-63.833) ENVELOPE(-57.183,-57.183,-64.466,-64.466) |
geographic |
Antarctic The Antarctic Patagonia New Zealand Argentina Hill Island Snow Hill Island isla Vega Snow Hill |
geographic_facet |
Antarctic The Antarctic Patagonia New Zealand Argentina Hill Island Snow Hill Island isla Vega Snow Hill |
genre |
Advances in Polar Science Antarc* Antarctic Antarctica Polar Science Polar Science Snow Hill Island |
genre_facet |
Advances in Polar Science Antarc* Antarctic Antarctica Polar Science Polar Science Snow Hill Island |
op_relation |
http://library.arcticportal.org/2694/1/A1903004.pdf O'Gorman, José Patricio and Otero, Rodrigo and Reguero, Marcelo and Gasparini, Zulma (2019) Cretaceous Antarctic plesiosaurs: stratigraphy, systematics and paleobiogeography. Advances in Polar Science, 30 (3). pp. 210-227. |
_version_ |
1784892308728053760 |