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Re: Ceratonykus braincase described



Nice... good eyesight seems not very suggestive of social insect
hunting or excavation in general... Although it is not said how good
sight it had relative to the non-alvarezsaur ancestral state.

2011/4/27 bh480@scn.org <bh480@scn.org>:
> 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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