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Re: Alioramus (Theropoda) braincase anatomy

The free version can now be downloaded from the AMNH:


On Sat, Mar 16, 2013 at 8:26 PM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
> A new monograph available in BioOne.
> The AMNH site has not listed the open access version yet.
> (http://digitallibrary.amnh.org/dspace/handle/2246/7)
> Gabe S. Bever, Stephen L. Brusatte, Thomas D. Carr, Xing Xu, Amy M.
> Balanoff, Mark A. Norell (2013)
> The Braincase Anatomy of the Late Cretaceous Dinosaur Alioramus
> (Theropoda: Tyrannosauroidea).
> Bulletin of the American Museum of Natural History 376 :1-72
> doi: http://dx.doi.org/10.1206/810.1
> http://www.bioone.org/toc/amnb/376/1
> The late Cretaceous tyrannosaurid Alioramus altai is known from a
> single specimen whose articulated braincase exhibits a nearly unique
> combination of preservational quality, subadult stage of growth, and
> morphological complexity. We use a detailed physical preparation
> combined with high-resolution computed tomography to provide an
> expanded description of this braincase that includes details of the
> neurocranium and its dermal roof, pneumatic recesses and sinuses,
> cranial endocast, and inner ear cavities. A few notable features
> include a highly developed rostral tympanic recess marked by three
> pneumatic fenestrae, a highly pneumatic paroccipital process with both
> rostral and caudal pneumatic foramina, a prootic fossa housing
> external foramina for the trigeminal and facial nerves, a
> well-developed superficial lamina of the prootic, an expanded
> vestibular cavity, and an osseous labyrinth that is plesiomorphic in
> appearance. These observations, set within the currently available
> comparative context, elucidate numerous neuroanatomical
> transformations within Tyrannosauroidea and clarify where more data
> and work are needed. We expand the discussion for the 21 characters
> from the neurocranium utilized in a recent revision of tyrannosauroid
> phylogeny, including a listing of which tyrannosauroid taxa can be
> scored for the primitive and derived states of each character.