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Abstract:

Heterodontosauridae is a morphologically divergent group of dinosaurs that has recently been interpreted as one of the most basal clades of Ornithischia. Heterodontosaurid remains were previously known from the Early Jurassic of southern Africa, but recent discoveries and studies have significantly increased the geographical and temporal range for this clade. Here, we report a new ornithischian dinosaur from the Middle Jurassic Cañadón Asfalto Formation in central Patagonia, Argentina. This new taxon, Manidens condorensis gen. et sp. nov., includes well-preserved craniomandibular and postcranial remains and represents the only diagnostic ornithischian specimen yet discovered in the Jurassic of South America so far. Derived features of its anatomy indicate that Manidens belongs to Heterodontosauridae, as the sister taxon of Heterodontosaurus and other South African heterodontosaurids. The presence of posterior dentary teeth with high crowns but lacking extensive wear facets in Manidens suggests that this form represents an intermediate stage in the development of the remarkable adaptations to herbivory described for Heterodontosaurus. The dentition of Manidens condorensis also has autapomorphies, such as asymmetrically arranged denticles in posterior teeth and a mesially projected denticle in the posteriormost teeth. At an estimated total length of 60-75 cm, Manidens furthermore confirms the small size of basal heterodontosaurids. © 2011 Springer-Verlag.

Registro:

Documento: Artículo
Título:A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids
Autor:Pol, D.; Rauhut, O.W.M.; Becerra, M.
Filiación:CONICET, Museo Paleontológico Egidio Feruglio, Fontana 140, Trelew 9100, Argentina
Bayerische Staatssammlung für Paläontologie und Geologie, Department of Earth and Environmental Sciences, LMU München, Richard-Wagner-Str. 10, 80333 Munich, Germany
Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria Pab. II, Ciudad Autónoma de Buenos Aires C1428EHA, Argentina
Palabras clave:Cañadón Asfalto Formation; Gondwana; Heterodontosauridae; Jurassic; Ornithschia; adaptation; anatomy; body size; cladistics; dinosaur; divergence; evolutionary biology; Gondwana; herbivory; Jurassic; morphology; new taxon; paleobiology; range expansion; taxonomy; tooth; animal; Argentina; article; bone; classification; dinosaur; evolution; fossil; histology; jaw; species difference; Animals; Argentina; Biological Evolution; Bone and Bones; Dinosaurs; Fossils; Jaw; Species Specificity; Patagonia; Dinosauria; Ornithischia
Año:2011
Volumen:98
Número:5
Página de inicio:369
Página de fin:379
DOI: http://dx.doi.org/10.1007/s00114-011-0780-5
Título revista:Naturwissenschaften
Título revista abreviado:Naturwissenschaften
ISSN:00281042
CODEN:NATWA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00281042_v98_n5_p369_Pol

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Citas:

---------- APA ----------
Pol, D., Rauhut, O.W.M. & Becerra, M. (2011) . A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids. Naturwissenschaften, 98(5), 369-379.
http://dx.doi.org/10.1007/s00114-011-0780-5
---------- CHICAGO ----------
Pol, D., Rauhut, O.W.M., Becerra, M. "A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids" . Naturwissenschaften 98, no. 5 (2011) : 369-379.
http://dx.doi.org/10.1007/s00114-011-0780-5
---------- MLA ----------
Pol, D., Rauhut, O.W.M., Becerra, M. "A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids" . Naturwissenschaften, vol. 98, no. 5, 2011, pp. 369-379.
http://dx.doi.org/10.1007/s00114-011-0780-5
---------- VANCOUVER ----------
Pol, D., Rauhut, O.W.M., Becerra, M. A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids. Naturwissenschaften. 2011;98(5):369-379.
http://dx.doi.org/10.1007/s00114-011-0780-5