A new plesiosaur (Reptilia: Sauropterygia) specimen from the Upper Cretaceous of West Antarctica, with comments on the ontogeny and morphological diversity of the elasmosaurid pelvic girdle

Miller, Case, O'Gorman, José P., Salisbury, Steven W., Coria, Rodolfo A., Roberts, Eric M., O'connor, Patrick M., Reguero, Marcelo A., and Lamanna, Matthe W.C. (2020) A new plesiosaur (Reptilia: Sauropterygia) specimen from the Upper Cretaceous of West Antarctica, with comments on the ontogeny and morphological diversity of the elasmosaurid pelvic girdle. Annals of Carnegie Museum, 86 (2). pp. 93-106.

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Abstract

Although knowledge of Mesozoic marine reptiles from Antarctica has improved considerably in recent years, associated and well-preserved skeletal material of these animals remains uncommon. Here we describe a largely complete, closely associated plesiosaur pelvic girdle recovered from the uppermost Cretaceous (Maastrichtian) Sandwich Bluff Member of the Lopez de Bertodano Formation of Vega Island, in the James Ross Basin of the northernmost Antarctic Peninsula. The new specimen exhibits characters that allow its referral to Elasmosauridae, but its incompleteness precludes a more precise taxonomic determination. Ontogenetically variable and systematically useful features of the clasmosaurid pelvis are reviewed and discussed. The new specimen improves knowledge of Southern Hemisphere clasmosaurids just prior to the K/Pg extinction event.

Item ID: 64680
Item Type: Article (Research - C1)
ISSN: 1943-6300
Keywords: Antarctic Peninsula, Elasmosauridae, James Ross Basin, Lopez de Bertodano Formation, Maastrichtian, Plesiosauria, Sandwich Bluff Member, Vega Island
Funders: Direccion Nacional del Antartico, IAA project (DNdA -IAA), University of Hong Kong Graduate School PGS, National Science Foundation (NSF)
Projects and Grants: DNdA -IAA grant number PICTO 2010-0093, NSF ANT-1142129, NSF ANT-1142104, NSF ANT-1141820, NSF ANT-1142052
Date Deposited: 21 Oct 2020 07:50
FoR Codes: 37 EARTH SCIENCES > 3705 Geology > 370506 Palaeontology (incl. palynology) @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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