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Abstract:

Dryolestoids are an extinct mammalian group belonging to the lineage leading to modern marsupials and placentals. Dryolestoids are known by teeth and jaws from the Jurassic period of North America and Europe, but they thrived in South America up to the end of the Mesozoic era and survived to the beginnings of the Cenozoic. Isolated teeth and jaws from the latest Cretaceous of South America provide mounting evidence that, at least in western Gondwana, dryolestoids developed into strongly endemic groups by the Late Cretaceous. However, the lack of pre-Late Cretaceous dryolestoid remains made study of their origin and early diversification intractable. Here we describe the first mammalian remains from the early Late Cretaceous of South America, including two partial skulls and jaws of a derived dryolestoid showing dental and cranial features unknown among any other group of Mesozoic mammals, such as single-rooted molars preceded by double-rooted premolars, combined with a very long muzzle, exceedingly long canines and evidence of highly specialized masticatory musculature. On one hand, the new mammal shares derived features of dryolestoids with forms from the Jurassic of Laurasia, whereas on the other hand, it is very specialized and highlights the endemic, diverse dryolestoid fauna from the Cretaceous of South America. Our specimens include only the second mammalian skull known for the Cretaceous of Gondwana, bridging a previous 60-million-year gap in the fossil record, and document the whole cranial morphology of a dryolestoid, revealing an unsuspected morphological and ecological diversity for non-tribosphenic mammals. © 2011 Macmillan Publishers Limited. All rights reserved.

Registro:

Documento: Artículo
Título:Highly specialized mammalian skulls from the Late Cretaceous of South America
Autor:Rougier, G.W.; Apesteguía, S.; Gaetano, L.C.
Filiación:Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, KY 40202, United States
CEBBAD-Fundación de Historia Natural Félix de Azara, Universidad Maimónides, Hidalgo 775, Buenos Aires (1405), Argentina
CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina
Departamento de Cs. Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA, Buenos Aires, Argentina
Palabras clave:cranium; Cretaceous; endemic species; fossil record; Gondwana; Jurassic; marsupial; paleontology; tooth; article; Cretaceous; fossil animal; jaw; molar tooth; nonhuman; premolar tooth; priority journal; skull; South America; Animals; Extinction, Biological; Fossils; Jaw; Mammals; Phylogeny; Skull; South America; Tooth; Europe; North America; South America; Dryolestoidea; Eutheria; Mammalia; Metatheria
Año:2011
Volumen:479
Número:7371
Página de inicio:98
Página de fin:102
DOI: http://dx.doi.org/10.1038/nature10591
Título revista:Nature
Título revista abreviado:Nature
ISSN:00280836
CODEN:NATUA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00280836_v479_n7371_p98_Rougier

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Citas:

---------- APA ----------
Rougier, G.W., Apesteguía, S. & Gaetano, L.C. (2011) . Highly specialized mammalian skulls from the Late Cretaceous of South America. Nature, 479(7371), 98-102.
http://dx.doi.org/10.1038/nature10591
---------- CHICAGO ----------
Rougier, G.W., Apesteguía, S., Gaetano, L.C. "Highly specialized mammalian skulls from the Late Cretaceous of South America" . Nature 479, no. 7371 (2011) : 98-102.
http://dx.doi.org/10.1038/nature10591
---------- MLA ----------
Rougier, G.W., Apesteguía, S., Gaetano, L.C. "Highly specialized mammalian skulls from the Late Cretaceous of South America" . Nature, vol. 479, no. 7371, 2011, pp. 98-102.
http://dx.doi.org/10.1038/nature10591
---------- VANCOUVER ----------
Rougier, G.W., Apesteguía, S., Gaetano, L.C. Highly specialized mammalian skulls from the Late Cretaceous of South America. Nature. 2011;479(7371):98-102.
http://dx.doi.org/10.1038/nature10591