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New evidence on brain-endocranial cavity relationships in ornithischian dinosaurs

100%

Evans D. C.

Acta Palaeontologica Polonica

2005

tom 50

nr 3

Discussions of brain morphology and relative brain size in nonavian dinosaurs have been complicated by uncertainty in the extent to which the brain filled the endocranial cavity. Recently reported vascular imprints (valleculae) on the endocranial surfaces of the braincase suggest that nonavian maniraptoriform theropods had brains that tightly fit the endocranium. Similar impressions of the intracranial vascular system are reported here in two ornithischian clades, Hadrosauridae and Pachycephalosauridae. These structures are more widespread in dinosaurs than previously thought, and suggest that the brain closely fit the endocranium in some regions of the forebrain through hindbrain in several distantly related dinosaur groups.

Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

51%

McFeeters B., Evans D. C., Maddin H. C.

Acta Palaeontologica Polonica

2021

tom 66

nr 3

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Evans D. C.

1 Maddin H. C.

1 McFeeters B.

1 2021

1 2005

Wyniki wyszukiwania

New evidence on brain-endocranial cavity relationships in ornithischian dinosaurs

Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA