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Abstract:

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.

Registro:

Documento: Artículo
Título: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
Autor:Ogorman, J.P.; Salgado, L.; Olivero, E.B.; Marenssi, S.A.
Filiación:División Paleontología Vertebrados, Museo de la Plata, Universidad Nacional de la Plata, Paseo del Bosque s/n., La Plata, B1900FWA, Argentina
CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917 - C.A.B.A, Argentina
CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Av. General Roca, General-Roca, 1242, Argentina
Centro Austral de Investigaciones Científicas-CONICET B. Houssay 200, Ushuaia, 9410, Argentina
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires-Universidad de Buenos Aires-CONICET, Ciudad Universitaria, Intendente Güiraldes 2160, Ciudad Autónoma de Buenos Aires, C1428EHA, Argentina
Palabras clave:anatomy; cranium; morphology; new species; new taxon; phylogenetics; reptile; Antarctica; Snow Hill Island; Vega Island; West Antarctica; Aristonectes; Elasmosauridae; Plesiosauria; Weddellia
Año:2015
Volumen:35
Número:3
DOI: http://dx.doi.org/10.1080/02724634.2014.931285
Título revista:Journal of Vertebrate Paleontology
Título revista abreviado:J. Vertebr. Paleontol.
ISSN:02724634
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v35_n3_p_Ogorman

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Citas:

---------- APA ----------
Ogorman, J.P., Salgado, L., Olivero, E.B. & Marenssi, S.A. (2015) . 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. Journal of Vertebrate Paleontology, 35(3).
http://dx.doi.org/10.1080/02724634.2014.931285
---------- CHICAGO ----------
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" . Journal of Vertebrate Paleontology 35, no. 3 (2015).
http://dx.doi.org/10.1080/02724634.2014.931285
---------- MLA ----------
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" . Journal of Vertebrate Paleontology, vol. 35, no. 3, 2015.
http://dx.doi.org/10.1080/02724634.2014.931285
---------- VANCOUVER ----------
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. J. Vertebr. Paleontol. 2015;35(3).
http://dx.doi.org/10.1080/02724634.2014.931285