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Ceratonykus braincase described



From: Ben Creisler
bh480@scn.org

A new paper not mentioned yet:

V. R. Alifanov and S. V. Saveliev (2011)
Brain structure and neurobiology of Alvarezsaurians (Dinosauria),
exemplified by Ceratonykus oculatus (Parvicursoridae) from the Late
Cretaceous of Mongolia. 
Paleontological Journal 45(2): 183-190,
DOI: 10.1134/S0031030111020031 

http://www.springerlink.com/content/e414833v04418u08/

A natural braincase cast of the Late Cretaceous dinosaur Ceratonykus
oculatus (Parvicursoridae, Alvarezsauria) is described. The brain of this
species is constructed based on the reptilian archetype without
dorsoventral curvatures. In the midbrain, the optic lobes are displaced
ventrolaterally and the acoustic lobes are very large and adjoin rostrally
the telencephalon. The cerebellum is bifid and transversely expanded. The
complex of the metencephalon and myelencephalon narrows laterally. Some of
the characters listed are not typical of the majority of extant and extinct
sauropsids. It is concluded that alvarezsaurians had good eyesight and keen
hearing and their ancestors were characterized by elements of an arboreal
mode of life. 


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