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Abstract:

Rhynchocephalian lepidosaurs, though once widespread worldwide, are represented today only by the tuatara (Sphenodon) of New Zealand. After their apparent early Cretaceous extinction in Laurasia, they survived in southern continents. In South America, they are represented by different lineages of Late Cretaceous eupropalinal forms until their disappearance by the Cretaceous/Palaeogene (K/Pg) boundary. We describe here the only unambiguous Palaeogene rhynchocephalian from South America; this new taxon is a younger species of the otherwise Late Cretaceous genus Kawasphenodon. Phylogenetic analysis confirms the allocation of the genus to the clade Opisthodontia. The new form from the Palaeogene of Central Patagonia is much smaller than Kawasphenodon expectatus from the Late Cretaceous of Northern Patagonia. The new species shows that at least one group of rhynchocephalians not related to the extant Sphenodon survived in South America beyond the K/Pg extinction event. Furthermore, it adds to other trans-K/Pg ectotherm tetrapod taxa, suggesting that the end-Cretaceous extinction affected Patagonia more benignly than the Laurasian landmasses. © 2014 The Author(s) Published by the Royal Society. All rights reserved.

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Documento: Artículo
Título:The youngest South American rhynchocephalian, a survivor of the K/Pg extinction
Autor:Apesteguía, S.; Gómez, R.O.; Rougier, G.W.
Filiación:CONICET-Fundación de Historia Natural 'Félix de Azara', CEBBAD-Universidad Maimónides, Hidalgo 775, Buenos Aires 1405, Argentina
CONICET-Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires 1428, Argentina
Department of Anatomical Sciences and Neurobiology, University of Louisville, 500 South Preston Street, Louisville, KY 40292, United States
Palabras clave:Cretaceous/palaeogene boundary; Opisthodontia; Palaeocene; Patagonia; Rhynchocephalia; cladistics; Cretaceous; ectothermy; extinction; Laurentia; lizard; Paleocene; Paleogene; taxonomy; New Zealand; South America
Año:2014
Volumen:281
Número:1792
DOI: http://dx.doi.org/10.1098/rspb.2014.0811
Título revista:Proceedings of the Royal Society B: Biological Sciences
Título revista abreviado:Proc. R. Soc. B Biol. Sci.
ISSN:09628452
CODEN:PRLBA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09628452_v281_n1792_p_Apesteguia

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Citas:

---------- APA ----------
Apesteguía, S., Gómez, R.O. & Rougier, G.W. (2014) . The youngest South American rhynchocephalian, a survivor of the K/Pg extinction. Proceedings of the Royal Society B: Biological Sciences, 281(1792).
http://dx.doi.org/10.1098/rspb.2014.0811
---------- CHICAGO ----------
Apesteguía, S., Gómez, R.O., Rougier, G.W. "The youngest South American rhynchocephalian, a survivor of the K/Pg extinction" . Proceedings of the Royal Society B: Biological Sciences 281, no. 1792 (2014).
http://dx.doi.org/10.1098/rspb.2014.0811
---------- MLA ----------
Apesteguía, S., Gómez, R.O., Rougier, G.W. "The youngest South American rhynchocephalian, a survivor of the K/Pg extinction" . Proceedings of the Royal Society B: Biological Sciences, vol. 281, no. 1792, 2014.
http://dx.doi.org/10.1098/rspb.2014.0811
---------- VANCOUVER ----------
Apesteguía, S., Gómez, R.O., Rougier, G.W. The youngest South American rhynchocephalian, a survivor of the K/Pg extinction. Proc. R. Soc. B Biol. Sci. 2014;281(1792).
http://dx.doi.org/10.1098/rspb.2014.0811