The endocranial morphology and inner ear of the abelisaurid theropod Aucasaurus garridoi

• Autorzy: Paulina-Carabajal A. , Succar C.
• Języki publikacji: EN

Abstrakty

EN

A partial cranial endocast and right inner ear of the Cretaceous abelisaurid dinosaur Aucasaurus garridoi were digitally reconstructed from CT scans. The forebrain, midbrain, and hindbrain resemble the morphology described for the abelisaurids Majungasaurus and Indosaurus. However, Aucasaurus exhibits a floccular process that is relatively larger than that of Majungasaurus. In Aucasaurus the flocculus is enclosed in an 8-shaped floccular recess, similar in shape and size to that observed in Abelisaurus, suggesting that the two Patagonian taxa were capable of a slightly wider range of movements of the head. Here we describe the second inner ear known for the Abelisauridae. The labyrinth of the inner ear is similar in shape and size to the semicircular canals of Majungasaurus, although the lateral semicircular canal is shorter in Aucasaurus.

Słowa kluczowe

EN

paleontology; endocranium; morphology; ear; abelisaurid theropod; theropod; Aucasaurus garridoi; dinosaur; Majungasaurus; Indosaurus

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2015
• Tom: 60
• Numer: 1
• Opis fizyczny: p.141-144,fig.,ref.

Twórcy

autor

Paulina-Carabajal A.

• CONICET-Museo Carmen Funes, Av.Cordoba 55 (8318), Plaza Huincul, Neuquen, Argentina

autor

Succar C.

• CONICET-Museo Carmen Funes, Av.Cordoba 55 (8318), Plaza Huincul, Neuquen, Argentina

Bibliografia

• Ali, F., Zelenitsky, D.K., Therrien, F., and Weishampel, D.B. 2008. Homology of the “ethmoid complex” of tyrannosaurids and its implications for the reconstruction of the olfactory apparatus of non-avian theropods. Journal of Vertebrate Paleontology 28: 123–133.
• Bonaparte, J.F. 1985. A horned Cretaceous carnosaur from Patagonia. National Geographic Research 1: 149–151.
• Bonaparte, J.F. and Novas, F. 1985. Abelisaurus comahuensis n. gen. n. sp. Carnosauria del cretácico superior de Patagonia. Ameghiniana 21: 259–265.
• Butler, A.B. and Hodos, W. 1996. Comparative Vertebrate Neuroanatomy: Evolution and Adaptation. 514 pp. Wiley-Liss, New York.
• Calvo, J.O., Rubilar-Rogers, D., and Moreno, K. 2004. A new Abelisauridae (Dinosauria: Theropoda) from northwest Patagonia. Ameghiniana 41: 555–563.
• Canale, J.I., Scanferla, C.A., Agnolin, F.L., and Novas, F.E. 2008. New carnivorous dinosaur from the Late Cretaceous of NW Patagonia and the evolution of abelisaurid theropods. Naturwissenschaften 96: 409–414.
• Coria, R.A., Chiappe, L.M., and Dingus, L. 2002. A new close relative of Carnotaurus sastrei Bonaparte 1985 (Theropoda: Abelisauridae) from the Late Cretaceous of Patagonia. Journal of Vertebrate Paleontology 22: 460–465.
• Depéret, C. 1896. Note sur les Dinosauriens Sauropodes et Théropodes du Crétacé supérieur de Madagascar. Bulletin de la Société Géologique de France 21: 176–194.
• Evans, D.C. 2005. New evidence on brain-endocranial cavity relationships in ornithischian dinosaurs. Acta Palaeontolologica Polonica 50: 617–622.
• Franzosa, J. and Rowe, T. 2005. Cranial endocast of the Cretaceous theropod dinosaur Acrocanthosaurus atokensis. Journal of Vertebrate Paleontology 25: 859–864.
• Galton, P.M. 1985. Cranial anatomy of the prosauropod dinosaur Plateosaurus from the Knollenmergel (Middle Keuper, Upper Triassic) of Germany. Geologica et Palaeontologica 19: 119–159.
• Hopson, J.A. 1979. Paleoneurology. In: C. Gans (ed.), Biology of the Reptilia, Volume 9. Neurology, 39–146. Academic Press, New York.
• Hopson, J.A. 1980. Relative brain size in dinosaurs: Implications for dinosaurian endothermy. In: R.D.K. Thomas and E.C. Olson (eds.), A Cold Look at the Warm Blooded Dinosaurs, 287–310. American Association for the Advancement of Science, Washington.
• Huene, F. von and Matley, C.A. 1933. The Cretaceous Saurischia and Ornithischia of the Central Provinces of India. Memoirs of the Geological Survey of India. Palaeontologica Indica 21: 1–72.
• Larsson, H.C.E. 2001. Endocranial anatomy of Carcharodontosaurus saharicus (Theropoda: Allosauroidea) and its implications for theropod brain evolution. In: D.H. Tanke and K. Carpenter (eds.), Mesozoic Vertebrate Life, 19–33. Indiana University Press, Indianapolis.
• Paulina Carabajal, A. 2011a. Braincases of abelisaurid theropods from the upper Cretaceous of north Patagonia. Palaeontology 54: 793–806.
• Paulina Carabajal, A. 2011b. The braincase anatomy of Carnotaurus sastrei (Theropoda: Abelisauridae) from the Upper Cretaceous of Patagonia. Journal of Vertebrate Paleontology 31: 378–386.
• Paulina Carabajal, A. and Currie P.J. 2012. New information on the braincase of Sinraptor dongi (Theropoda: Allosauroidea): ethmoidal region, endocranial anatomy, and pneumaticity. Vertebrata PalAsiatica 50: 85–101.
• Sampson, S.D. and Witmer, L.M. 2007. Cranofacial anatomy of Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. Journal of Vertebrate Paleontology, Memoir 8: 32–102.
• Sampson, S.D., Witmer, L.M., Forster, C.A., Krause, D.W., O’Connor, P.M., Dodson, P., and Ravoavy, F. 1998. Predatory dinosaur remains from Madagascar: implications for the Cretaceous biogeography of Gondwana. Science 280: 1048–1081.
• Sanders, R.K. and Smith, D.K. 2005. The endocranium of the theropod dinosaur Ceratosaurus studied with computed tomography. Acta Palaeontologica Polonica 50: 601–616.
• Sereno, P.C., Wilson, J.A., Witmer, L.M., Whitlock, J.A., Maga, A., Ide, O., and Rowe, T.A. 2007. Structural extremes in a Cretaceous dinosaur. PLoS ONE 2: 21230.
• Succar, C. and Paulina Carabajal, A. 2011. Neuroanatomía de los dinosaurios del Cretácico Superior de Patagonia: un enfoque en Aucasaurus garridoi Coria, Chiappe y Dingus 2002 (Theropoda, Abelisauridae). Ameghiniana 48 (Supplement 4): R251.
• Wilson, J.A., Sereno, P.C., Srivastava, S., Bhatt, D.K., Khosla, A., and Sahni, A. 2003. A new abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India. Contributions from the Museum of Paleontology, University of Michigan 31: 1–42.
• Witmer, L.M., Chatterjee, S., Franzosa J., and Rowe T. 2003. Neuroanatomy of flying reptiles and implications for flight, posture and behaviour. Nature 425: 950–953.
• Witmer, L.M., Ridgely, R.C., Dufeau, D.L., and Semones, C. 2008. Using CT to peer into the past: 3D visualization of the brain and ear regions of birds, crocodiles, and nonavian dinosaurs. In: H. Endo and R. Frey (eds.), Anatomical Imaging: Towards a New Morphology, 67–87. Springer, Tokyo.
• Winship, I.R. and Wylie, D.R.W. 2003. Zonal organization of the vestibulocerebellum in pigeons (Columba livia): I. Climbing fiber input to the flocculus. Journal of Comparative Neurology 456: 127–139.

Identyfikatory

DOI

dx.doi.org/10.4202/app.2013.0037