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: Kawanectes lafquenianum nov. comb. from the late Campanian—early Maastrichtian Allen Format...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2016
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Online Access: | http://sedici.unlp.edu.ar/handle/10915/108247 |
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ftunivlaplata:oai:sedici.unlp.edu.ar:10915/108247 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) |
op_collection_id |
ftunivlaplata |
language |
English |
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: Kawanectes lafquenianum 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 K. lafquenianum closely related with Morenosaurus stocki, Vegasaurus molyi , and Aristonectinae, showing the relationships between the elasmosaurids from Patagonia, Western Antarctic, and the Pacific coast of the USA. K. lafquenianum 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. La sistemática de los elasmosáuridos no aristonectinos del Cretácico de la Patagonia Argentina es poco conocida, no habiendo ninguna especie válida reconocida actualmente. En esta contribución un nuevo elasmosáurido no aristonectino: Kawanectes lafquenianum nov. comb. proveniente de la Formación Allen (Campaniano superior–Maastrichtiano inferior) es diagnosticado. K. lafquenianum es un elasmosáurido no aristonectino de pequeño tamaño corporal que se caracteriza por la presencia de vértebras caudales con parapófisis fuertemente proyectadas lateralmente, presencia de barra pélvica, elevada proporción longitud del húmero / longitud del fémur (~1,2) y una marcada proyección posterodistal del húmero que lleva una carilla articular accesoria. El análisis filogenético recupera a K. lafquenianum , estrechamente relacionado con Morenosaurus stocki, Vegasaurus molyi y los aristonectinos que muestran las relaciones entre los elasmosáuridos del norte de Patagonia, Antártida Occidental y la costa pacífica de USA. K. lafquenianum es parte de la fauna de las formaciones coetáneas Allen y La Colonia, que comprende aristonectinos indeterminados y policotílidos. Esta diversidad relativamente alta, con los tres morfotipos principales presentes (elasmosáuridos aristonectinos, elasmosáuridos no aristonectinos y policotílidos), es notable ya que el ambiente de depositación de la Formación Allen se ha inferido como marino marginal con intercalaciones de ambientes no marinos. Facultad de Ciencias Naturales y Museo |
format |
Article in Journal/Newspaper |
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 |
long_lat |
ENVELOPE(-61.417,-61.417,-64.367,-64.367) |
geographic |
Alta Antarctic Antarctic Peninsula Argentina Barra Pacific Patagonia |
geographic_facet |
Alta Antarctic Antarctic Peninsula Argentina Barra Pacific Patagonia |
genre |
Antarc* Antarctic Antarctic Peninsula Antártica Antártida |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antártica Antártida |
op_relation |
Ameghiniana vol. 53, no. 3 http://sedici.unlp.edu.ar/handle/10915/108247 issn:0002-7014 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
op_rightsnorm |
CC-BY-NC-SA |
_version_ |
1766273424758407168 |
spelling |
ftunivlaplata:oai:sedici.unlp.edu.ar:10915/108247 2023-05-15T14:02:58+02:00 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 Un pequeño elasmosáurido no aristonectino (sauropterygia, plesiosauria) del cretácico superior de patagonia con comentarios sobre la relación entre los elasmosáuridos de Antártida y Patagonia O'Gorman, José Patricio 2016-06-01 application/pdf 245-268 http://sedici.unlp.edu.ar/handle/10915/108247 en eng Ameghiniana vol. 53, no. 3 http://sedici.unlp.edu.ar/handle/10915/108247 issn:0002-7014 http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) CC-BY-NC-SA Ciencias Naturales Elasmosauridae Upper Cretaceous Patagonia Antarctic Peninsula Cretácico Superior Península Antártica Articulo 2016 ftunivlaplata 2020-11-08T01:02:22Z 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: Kawanectes lafquenianum 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 K. lafquenianum closely related with Morenosaurus stocki, Vegasaurus molyi , and Aristonectinae, showing the relationships between the elasmosaurids from Patagonia, Western Antarctic, and the Pacific coast of the USA. K. lafquenianum 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. La sistemática de los elasmosáuridos no aristonectinos del Cretácico de la Patagonia Argentina es poco conocida, no habiendo ninguna especie válida reconocida actualmente. En esta contribución un nuevo elasmosáurido no aristonectino: Kawanectes lafquenianum nov. comb. proveniente de la Formación Allen (Campaniano superior–Maastrichtiano inferior) es diagnosticado. K. lafquenianum es un elasmosáurido no aristonectino de pequeño tamaño corporal que se caracteriza por la presencia de vértebras caudales con parapófisis fuertemente proyectadas lateralmente, presencia de barra pélvica, elevada proporción longitud del húmero / longitud del fémur (~1,2) y una marcada proyección posterodistal del húmero que lleva una carilla articular accesoria. El análisis filogenético recupera a K. lafquenianum , estrechamente relacionado con Morenosaurus stocki, Vegasaurus molyi y los aristonectinos que muestran las relaciones entre los elasmosáuridos del norte de Patagonia, Antártida Occidental y la costa pacífica de USA. K. lafquenianum es parte de la fauna de las formaciones coetáneas Allen y La Colonia, que comprende aristonectinos indeterminados y policotílidos. Esta diversidad relativamente alta, con los tres morfotipos principales presentes (elasmosáuridos aristonectinos, elasmosáuridos no aristonectinos y policotílidos), es notable ya que el ambiente de depositación de la Formación Allen se ha inferido como marino marginal con intercalaciones de ambientes no marinos. Facultad de Ciencias Naturales y Museo Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antártica Antártida Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual) Alta Antarctic Antarctic Peninsula Argentina Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) Pacific Patagonia |