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Ceratosaurus endocranium, ornithischian brain size



Two new Mesozoic dinosaur papers in the new Acta Paleontologica Polonica.

Sanders, R.K. and Smith, D.K. 2005. The endocranium of the theropod dinosaur Ceratosaurus studied with computed tomography. Acta Palaeontologica Polonica 50 (3): 601?616.
http://app.pan.pl/acta50/app50-601.pdf


Very interesting. Though they call Ceratosaurus a tetanurine (ha!), the braincase description is quite extensive. They find both Ceratosaurus and Alioramus have pneumatic frontals, which means the character's more common than previously thought. The authors also found ridges indicating caudal olfactory conchae, as have been previously reported in Nanotyrannus. Oddly, Ceratosaurus also has hollow paroccipital processes, which are supposed to be restricted to coelurosaurs.

Evans, D.C. 2005. New evidence on brain−endocranial cavity relationships in ornithischian dinosaurs. Acta Palaeontologica Polonica 50 (3): 617?622.
http://app.pan.pl/acta50/app50-617.pdf


Apparently hadrosaurids and pachycephalosaurids have vascular imprints on their endrocranial surfaces, showing that their brains filled their skulls, much as in maniraptoriformes. Thus, their EQ is higher than previously believed.

Mickey Mortimer