INVESTIGADORES
PAULINA CARABAJAL ariana
artículos
Título:
An incomplete Upper Cretaceous titanosaur (Sauropoda) braincase: new insights on the dinosaurian inner ear and endocranium
Autor/es:
PAULINA CARABAJAL, A.; CORIA, R. A.; CHIAPPE, L.
Revista:
CRETACEOUS RESEARCH (PRINT)
Editorial:
Elsevier
Referencias:
Año: 2008 vol. 29 p. 643 - 648
ISSN:
0195-6671
Resumen:
Abstract An incomplete braincase from the Upper Cretaceous Portezuelo Formation of northwestern Patagonia (Neuque´n Province, Argentina) is described. The specimen preserves the lateral walls formed by the laterosphenoid, probably part of the orbitosphenoid, prootic, the exoccipitalopisthotic complex and fragments of the frontal, parietal and basisphenoid. Both inner ears are preserved allowing the production of latex endocasts. The external and internal morphology of the laterosphenoid and the prootic, the absence of a floccular recess, and the morphology and position of the cranial nerves VeVII, the oval window and the metotic foramen indicate that the new braincase belongs to a sauropod dinosaur, probably a titanosaur. The morphology of the inner ear is also reminiscent of that of Sauropoda, which is characterized by the presence of a simple, short and conical lagena, a posterior semicircular canal that is larger than the lateral semicircular canal, an anterior semicircular canal that is larger than the other two, and an angle between the vertical semicircular canals (anterior and posterior) of approximately 90. dinosaur, probably a titanosaur. The morphology of the inner ear is also reminiscent of that of Sauropoda, which is characterized by the presence of a simple, short and conical lagena, a posterior semicircular canal that is larger than the lateral semicircular canal, an anterior semicircular canal that is larger than the other two, and an angle between the vertical semicircular canals (anterior and posterior) of approximately 90. dinosaur, probably a titanosaur. The morphology of the inner ear is also reminiscent of that of Sauropoda, which is characterized by the presence of a simple, short and conical lagena, a posterior semicircular canal that is larger than the lateral semicircular canal, an anterior semicircular canal that is larger than the other two, and an angle between the vertical semicircular canals (anterior and posterior) of approximately 90. dinosaur, probably a titanosaur. The morphology of the inner ear is also reminiscent of that of Sauropoda, which is characterized by the presence of a simple, short and conical lagena, a posterior semicircular canal that is larger than the lateral semicircular canal, an anterior semicircular canal that is larger than the other two, and an angle between the vertical semicircular canals (anterior and posterior) of approximately 90. eVII, the oval window and the metotic foramen indicate that the new braincase belongs to a sauropod dinosaur, probably a titanosaur. The morphology of the inner ear is also reminiscent of that of Sauropoda, which is characterized by the presence of a simple, short and conical lagena, a posterior semicircular canal that is larger than the lateral semicircular canal, an anterior semicircular canal that is larger than the other two, and an angle between the vertical semicircular canals (anterior and posterior) of approximately 90. 2008 Elsevier Ltd. All rights reserved.2008 Elsevier Ltd. All rights reserved. Keywords: Braincase; Inner Ear; Sauropod; Cretaceous, PatagoniaBraincase; Inner Ear; Sauropod; Cretaceous, Patagonia