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The first non-aristonectine elasmosaurid (Sauropterygia; Plesiosauria) cranial material from Antarctica: new data on the evolution of the elasmosaurid basicranium and palate
División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina..
cMuseo Carmen Funes, Av. Córdoba 55 (8318), Plaza Huincul, Neuquén, Argentina. .
División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina..ORCID iD: 0000-0003-0875-8484
dInstituto Antártico Argentino, 25 de Mayo 1143, B1650HMK San Martín, Buenos Aires, Argentina.
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2018 (English)In: Cretaceous research (Print), ISSN 0195-6671, E-ISSN 1095-998XArticle in journal (Refereed) Published
Abstract [en]

Elasmosaurids are a monophyletic group of cosmopolitan plesiosaurs with extremely long necks. Although abundant elasmosaurid material has been collected from the Upper Cretaceous of Antarctica, skull material is extremely rare. Here, new elasmosaurid cranial material from the lower Maastrichtian levels of the Cape Lamb Member (Snow Hill Island Formation) on Vega Island, Antarctica is described. The studied specimen (MLP 15-I-7-6) is a non-aristonectine elasmosaurid but shows a palate morphology characterized by the absence of a posterior interpterygoid symphysis and a posterior plate-like extension of the pterygoids, features previously associated with the  aristonectine palatal structure. The specimen MLP 15-I-7-6 thus provides an indication that these palatal features are also present in non-aristonectine Weddellian elasmosaurids, and makes available additional evidence of the close phylogenetical relationship between the aristonectines and some Weddellian non-aristonectine elasmosaurids.

Place, publisher, year, edition, pages
Elsevier, 2018.
National Category
Earth and Related Environmental Sciences Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-2944DOI: 10.1016/j.cretres.2018.03.013OAI: oai:DiVA.org:nrm-2944DiVA, id: diva2:1263130
Projects
The frozen Garden of Eden - Paleogene Mammals from Seymour Island, Antarctica: evidence for Gondwanan biogeography and palaeoclimate
Funder
Swedish Research Council, VR 2009-4447Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-11-14Bibliographically approved

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