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We report here the first amphilestid triconodont from the Jurassic of South America. The specimen, a single isolated molariform, was found at the Queso Rallado locality from where a growing mammalian fauna is known (including a triconodontid, two australosphenidans, and an as yet undescribed allotherian). The specimen, interpreted as a left lower tooth, presents five mesiodistally aligned, fairly symmetrical cusps, and is recognized as the type of a new taxon, Condorodon spanios. The phylogenetic analysis recovers Condorodon as a member of the clade Amphilestheria, closely related to Tendagurodon janenschi, an amphilestid triconodont from the Late Jurassic of Tanzania. Condorodon spanios is only distantly related to Argentoconodon fariasorum, the other triconodont known from Queso Rallado quarry. The phylogenetic position of Condorodon spanios points to the origin and diversification of amphilestherians during the Early Jurassic in a paleogeographical setting that allowed wide dispersion of these forms and argues, at least from the mammalian evidence, against a highly provincialized Pangaea. Some differences are however established between the filial western/eastern Gondwanan masses and their respective faunas. © 2012 Springer Science+Business Media, LLC.


Documento: Artículo
Título:First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina
Autor:Gaetano, L.C.; Rougier, G.W.
Filiación:IDEAN, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
Department of Anatomical Sciences and Neurobiology, University of Louisville, 500 S. Preston St, Louisville, KY, 40292, United States
Palabras clave:Amphilestid; Jurassic; South America; Triconodont; Allotheria; Amphilestidae; Mammalia
Página de inicio:235
Página de fin:248
Título revista:Journal of Mammalian Evolution
Título revista abreviado:J. Mamm. Evol.


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---------- APA ----------
Gaetano, L.C. & Rougier, G.W. (2012) . First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina. Journal of Mammalian Evolution, 19(4), 235-248.
---------- CHICAGO ----------
Gaetano, L.C., Rougier, G.W. "First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina" . Journal of Mammalian Evolution 19, no. 4 (2012) : 235-248.
---------- MLA ----------
Gaetano, L.C., Rougier, G.W. "First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina" . Journal of Mammalian Evolution, vol. 19, no. 4, 2012, pp. 235-248.
---------- VANCOUVER ----------
Gaetano, L.C., Rougier, G.W. First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina. J. Mamm. Evol. 2012;19(4):235-248.