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BibTeX
Neuroanatomy of Titanosaurid Dinosaurs From the Upper Cretaceous of Patagonia, With Comments on Endocranial Variability Within Sauropoda
Anatomical record (Hoboken, N.J. : 2007), 2012-12, Vol.295 (12), p.2141-2156
Carabajal, Ariana Paulina
2012
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Carabajal, Ariana Paulina
Titel
Neuroanatomy of Titanosaurid Dinosaurs From the Upper Cretaceous of Patagonia, With Comments on Endocranial Variability Within Sauropoda
Ist Teil von
Anatomical record (Hoboken, N.J. : 2007), 2012-12, Vol.295 (12), p.2141-2156
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2012
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
The purpose of this study is to provide a detailed description of the neuroanatomy of Bonatitan, Antarctosaurus, and an unnamed titanosaur from Río Negro, Argentina including the first observations on the inner ear of the two first taxa using CT scans. The materials were compared with previously described sauropod endocasts and other less complete titanosaur braincases from Argentina. The cranial endocasts show the general morphology of other sauropods being bulbous, anteroposteriorly short and transversely wide, and with enlarged and posteroventrally projected pituitary body. Particular titanosaur traits are the extremely short and horizontal olfactory tract, the absence of a floccular process and a single root for cranial nerve XII. In addition, in the basicranium the abducens nerve (CN VI) does not penetrates the pituitary fossa and the internal carotid artery enters the medial aspect of the basipterygoid process, resulting in an external opening for this vessel that is not visible in lateral view of the braincase. The titanosaurid inner ear also exhibits particular traits, such as robust semicircular canals, and anterior and posterior semicircular canals that are subequal in size. The variation observed in the sauropod endocranium indicates an evolutionary tendency in titanosaurs toward the anteroposterior shortening of the midbrain, and the reduction in size of the semicircular canals of the inner ear, in particular the anterior semicircular canal. This, together with the lack of floccular process suggests a narrower range of movements of the head for this clade. Anat Rec, 2012. © 2012 Wiley Periodicals, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 1932-8486
eISSN: 1932-8494
DOI: 10.1002/ar.22572
Titel-ID: cdi_proquest_miscellaneous_1178668939
Format
–
Schlagworte
Animals
,
Antarctosaurus
,
Argentina
,
Biological Evolution
,
Bonatitan
,
Brain - anatomy & histology
,
Brain - diagnostic imaging
,
cranial endocast
,
Dinosaurs - anatomy & histology
,
Dinosaurs - classification
,
Ear, Inner - anatomy & histology
,
Ear, Inner - diagnostic imaging
,
Fossils
,
inner ear
,
Mesencephalon - anatomy & histology
,
Multidetector Computed Tomography
,
paleoneuroanatomy
,
Paleontology
,
Prosencephalon - anatomy & histology
,
Rhombencephalon - anatomy & histology
,
Saltasaurus
,
Saltasaurus, cranial endocast
,
Skull - anatomy & histology
,
Skull - diagnostic imaging
,
Species Specificity
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