A Virtual Phytosaur Endocast and Its Implications for Sensory System Evolution in Archosaurs

@inproceedings{Holloway2013AVP,
  title={A Virtual Phytosaur Endocast and Its Implications for Sensory System Evolution in Archosaurs},
  author={Waymon L. Holloway and Kerin M. Claeson and F. Robin O'Keefe},
  year={2013}
}
ABSTRACT Many recent studies have detailed the morphology of archosaurian endocrania. However, the outgroup to Archosauria, Phytosauria, has yet to be studied with modern techniques that would allow reconstruction of their internal anatomy. Pseudopalatus mccauleyi is a derived phytosaur from the Upper Triassic Chinle Formation, Arizona. A skull of P. mccauleyi, USNM 15839, was imaged using computed tomography in order to create the first high-quality, digitally reconstructed phytosaur… Expand
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References

SHOWING 1-10 OF 138 REFERENCES
A giant skull, ontogenetic variation and taxonomic validity of the Late Triassic phytosaur Parasuchus
TLDR
The largest known specimen of this primitive taxon, an incomplete skull from the Popo Agie Formation in northwestern Wyoming, demonstrates that the nares remain anterior to the antorbital fenestra throughout the ontogeny of Parasuchus, an observation confirmed by an analysis of a broad database. Expand
THE ANATOMY OF EFFIGIA OKEEFFEAE (ARCHOSAURIA, SUCHIA), THEROPOD-LIKE CONVERGENCE, AND THE DISTRIBUTION OF RELATED TAXA
TLDR
Effigia conclusively indicates that the skull of Shuvosaurus and the postcrania of “Chatterjeea” belong to the same taxon, and the close relationship between Shuvosaurs and Effigia indicates that both taxa are nested within the suchian clade and not within Ornithomimisauria. Expand
Allosaurus, crocodiles, and birds: Evolutionary clues from spiral computed tomography of an endocast
  • S. Rogers
  • Biology, Medicine
  • The Anatomical record
  • 1999
TLDR
The ability to directly examine the neuroanatomy of an extinct dinosaur, whose modern‐day relatives are birds and crocodiles, has exciting implications about Allosaurus' behavior, its adaptive responses to its environment, and its eventual extinction. Expand
Endocranial Anatomy of Lambeosaurine Hadrosaurids (Dinosauria: Ornithischia): A Sensorineural Perspective on Cranial Crest Function
TLDR
The large brains of lambeosaurines are consistent with the range of social behaviors inferred when the crest is interpreted as an intraspecific signaling structure. Expand
Structural Extremes in a Cretaceous Dinosaur
TLDR
Skeletal and dental evidence suggests that Nigersaurus was a ground-level herbivore that gathered and sliced relatively soft vegetation, the culmination of a low-browsing feeding strategy first established among diplodocoids during the Jurassic. Expand
Osteoderms of Simosuchus clarki (Crocodyliformes: Notosuchia) from the Late Cretaceous of Madagascar
TLDR
The anatomy, arrangement, and histology of the osteoderms of S. clarki are described, and comments on the phylogenetic and functional importance of these structures are provided, and several new morphological characters are described. Expand
A New Sauropodomorph Dinosaur from the Early Jurassic of Patagonia and the Origin and Evolution of the Sauropod-type Sacrum
TLDR
The dental and postcranial anatomy of Leonerasaurus supports its close affinities with basal sauropods, and shows that the characteristic sauropod body plan evolved gradually, with a step-wise pattern of character appearance. Expand
Cranial osteology and phylogenetic relationships of Hamadasuchus rebouli (Crocodyliformes: Mesoeucrocodylia) from the Cretaceous of Morocco
TLDR
A detailed description of the skull and part of the mandible of the crocodyliform reptile Hamadasuchus rebouli from the Kem Kem beds of south-eastern Morocco is presented, lending further support to the biogeographical hypothesis that faunal connections existed between Africa and South America well into mid-Cretaceous times. Expand
The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida)
TLDR
This analysis produces a well-resolved phylogeny, which recovers mostly traditional relationships within Avemetatarsalia, places Phytosauria as a basal crurotarsan clade, finds a close relationship between Aetosaurian and Crocodylomorpha, and recovers a monophyletic Rauisuchia comprised of two major subclades. Expand
CRANIOFACIAL ANATOMY OF MAJUNGASAURUS CRENATISSIMUS (THEROPODA: ABELISAURIDAE) FROM THE LATE CRETACEOUS OF MADAGASCAR
Abstract Recent fieldwork in the Upper Cretaceous (Maastrichtian) Maevarano Formation, northwest Madagascar, has yielded important new skull material of the abelisaurid theropod, MajungasaurusExpand
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4
5
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