A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids

The systematics of the Late Cretaceous non-aristonectine elasmosaurids from Argentinean Patagonia are poorly known as there is no valid species currently recognized. Here a new non-aristonectine elasmosaurid: <i>Kawanectes lafquenianum</i> nov. comb. from the late Campanian—early Maastri...

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Detalles Bibliográficos
Autor principal: O'Gorman, José Patricio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Elasmosauridae
Upper Cretaceous
Patagonia
Antarctic Peninsula
Cretácico Superior
Península Antártica
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/108247
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-108247
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Elasmosauridae
Upper Cretaceous
Patagonia
Antarctic Peninsula
Cretácico Superior
Península Antártica
spellingShingle Ciencias Naturales
Elasmosauridae
Upper Cretaceous
Patagonia
Antarctic Peninsula
Cretácico Superior
Península Antártica
O'Gorman, José Patricio
A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
topic_facet Ciencias Naturales
Elasmosauridae
Upper Cretaceous
Patagonia
Antarctic Peninsula
Cretácico Superior
Península Antártica
description The systematics of the Late Cretaceous non-aristonectine elasmosaurids from Argentinean Patagonia are poorly known as there is no valid species currently recognized. Here a new non-aristonectine elasmosaurid: <i>Kawanectes lafquenianum</i> nov. comb. from the late Campanian—early Maastrichtian Allen Formation is diagnosed. K. lafquenianum is a distinctively small-body sized non-aristonectine elasmosaurid characterized by caudal vertebrae with marked laterally projected parapophyses, presence of pelvic bar, high ratio (∼1.2) between humerus/femur length and a large posterodistal projection of the humerus which bears a posterior accessory articular facet. A phylogenetic analysis recovered <i>K. lafquenianum</i> closely related with <i>Morenosaurus stocki, Vegasaurus molyi</i>, and Aristonectinae, showing the relationships between the elasmosaurids from Patagonia, Western Antarctic, and the Pacific coast of the USA. <i>K. lafquenianum</i> is part of the fauna of the coeval Allen and La Colonia formations that also comprises indeterminate aristonectines and polycotylids. This relatively high diversity plesiosaur fauna includes the three main morphotypes (aristonectines, non-aristonectine elasmosaurids and polycotylids), which is remarkable because the depositational environments of the Allen Formation have been inferred as marginal marine to non-marine environments.
format Articulo
Articulo
author O'Gorman, José Patricio
author_facet O'Gorman, José Patricio
author_sort O'Gorman, José Patricio
title A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
title_short A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
title_full A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
title_fullStr A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
title_full_unstemmed A Small Body Sized Non-Aristonectine Elasmosaurid (Sauropterygia, Plesiosauria) from the Late Cretaceous of Patagonia with Comments on the Relationships of the Patagonian and Antarctic Elasmosaurids
title_sort small body sized non-aristonectine elasmosaurid (sauropterygia, plesiosauria) from the late cretaceous of patagonia with comments on the relationships of the patagonian and antarctic elasmosaurids
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/108247
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