Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae

A new elasmosaurid, Vegasaurus molyi, gen. et sp. nov., from Vega Island, James Ross Archipelago, Antarctica, is described. The holotype and only specimen of this species (MLP 93-I-5-1) was collected from the lower Maastrichtian Cape Lamb Member of the Snow Hill Island Formation. Vegasaurus molyi is...

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Detalles Bibliográficos
Autores principales: Ogorman, J.P., Salgado, L., Olivero, E.B., Marenssi, S.A.
Formato: JOUR
Materias:
anatomy
cranium
morphology
new species
new taxon
phylogenetics
reptile
Antarctica
Snow Hill Island
Vega Island
West Antarctica
Aristonectes
Elasmosauridae
Plesiosauria
Weddellia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02724634_v35_n3_p_Ogorman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02724634_v35_n3_p_Ogorman
record_format dspace
spelling todo:paper_02724634_v35_n3_p_Ogorman2023-10-03T15:15:11Z Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae Ogorman, J.P. Salgado, L. Olivero, E.B. Marenssi, S.A. anatomy cranium morphology new species new taxon phylogenetics reptile Antarctica Snow Hill Island Vega Island West Antarctica Aristonectes Elasmosauridae Plesiosauria Weddellia A new elasmosaurid, Vegasaurus molyi, gen. et sp. nov., from Vega Island, James Ross Archipelago, Antarctica, is described. The holotype and only specimen of this species (MLP 93-I-5-1) was collected from the lower Maastrichtian Cape Lamb Member of the Snow Hill Island Formation. Vegasaurus molyi is the only Antarctic elasmosaurid and one of only a few Late Cretaceous elasmosaurids from the Southern Hemisphere whose postcranial anatomy is well known. Vegasaurus molyi is distinguished from other elasmosaurids by the following combination of characters: cervical region with 54 vertebrae with elongated centra, dumbbell-shaped articular faces and lateral ridge present in the anterior and middle parts of the neck but absent in the posterior-most cervical vertebrae; scapula with ventral ramus bearing a strong ridge in the anteromedial corner of its dorsal surface; ilium shaft with expanded distal end, divided into two parts forming an angle of 140°opening anteriorly; and humerus with anterior knee and prominent posterior projection with accessory posterior articular facet. Preliminary phylogenetic analysis places V. molyi within a clade that includes the Late Cretaceous Wedellian aristonectine elasmosaurids, Aristonectes and Kaiwhekea. This indicates a close relationship between Aristonectinae and non-Aristonectinae Late Cretaceous Weddellian elasmosaurids and suggests a Weddellian origin for the Aristonectinae. © 2015 by the Society of Vertebrate Paleontology. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02724634_v35_n3_p_Ogorman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic anatomy
cranium
morphology
new species
new taxon
phylogenetics
reptile
Antarctica
Snow Hill Island
Vega Island
West Antarctica
Aristonectes
Elasmosauridae
Plesiosauria
Weddellia
spellingShingle anatomy
cranium
morphology
new species
new taxon
phylogenetics
reptile
Antarctica
Snow Hill Island
Vega Island
West Antarctica
Aristonectes
Elasmosauridae
Plesiosauria
Weddellia
Ogorman, J.P.
Salgado, L.
Olivero, E.B.
Marenssi, S.A.
Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
topic_facet anatomy
cranium
morphology
new species
new taxon
phylogenetics
reptile
Antarctica
Snow Hill Island
Vega Island
West Antarctica
Aristonectes
Elasmosauridae
Plesiosauria
Weddellia
description A new elasmosaurid, Vegasaurus molyi, gen. et sp. nov., from Vega Island, James Ross Archipelago, Antarctica, is described. The holotype and only specimen of this species (MLP 93-I-5-1) was collected from the lower Maastrichtian Cape Lamb Member of the Snow Hill Island Formation. Vegasaurus molyi is the only Antarctic elasmosaurid and one of only a few Late Cretaceous elasmosaurids from the Southern Hemisphere whose postcranial anatomy is well known. Vegasaurus molyi is distinguished from other elasmosaurids by the following combination of characters: cervical region with 54 vertebrae with elongated centra, dumbbell-shaped articular faces and lateral ridge present in the anterior and middle parts of the neck but absent in the posterior-most cervical vertebrae; scapula with ventral ramus bearing a strong ridge in the anteromedial corner of its dorsal surface; ilium shaft with expanded distal end, divided into two parts forming an angle of 140°opening anteriorly; and humerus with anterior knee and prominent posterior projection with accessory posterior articular facet. Preliminary phylogenetic analysis places V. molyi within a clade that includes the Late Cretaceous Wedellian aristonectine elasmosaurids, Aristonectes and Kaiwhekea. This indicates a close relationship between Aristonectinae and non-Aristonectinae Late Cretaceous Weddellian elasmosaurids and suggests a Weddellian origin for the Aristonectinae. © 2015 by the Society of Vertebrate Paleontology.
format JOUR
author Ogorman, J.P.
Salgado, L.
Olivero, E.B.
Marenssi, S.A.
author_facet Ogorman, J.P.
Salgado, L.
Olivero, E.B.
Marenssi, S.A.
author_sort Ogorman, J.P.
title Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
title_short Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
title_full Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
title_fullStr Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
title_full_unstemmed Vegasaurus molyi, gen. et sp. nov. (Plesiosauria, Elasmosauridae), from the Cape Lamb Member (lower maastrichtian) of the Snow Hill Island Formation, Vega Island, Antarctica, and remarks on Wedellian Elasmosauridae
title_sort vegasaurus molyi, gen. et sp. nov. (plesiosauria, elasmosauridae), from the cape lamb member (lower maastrichtian) of the snow hill island formation, vega island, antarctica, and remarks on wedellian elasmosauridae
url http://hdl.handle.net/20.500.12110/paper_02724634_v35_n3_p_Ogorman
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AT salgadol vegasaurusmolyigenetspnovplesiosauriaelasmosauridaefromthecapelambmemberlowermaastrichtianofthesnowhillislandformationvegaislandantarcticaandremarksonwedellianelasmosauridae
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