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Re: Ceratonykus braincase described
On Thu, Apr 28th, 2011 at 4:58 AM, Augusto Haro <email@example.com> wrote:
> 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.
Then again, keen hearing would be very useful for an animal that hunts hidden
insect prey. There'd
be no point wasting energy ripping open a log or a termite mound if there was
nothing inside it.
It seems that alvarezsaurs had such an eclectic mixture of apparently
mis-matched traits that
trying to deduct their lifestyles based solely on physical practicalities may
be nigh on impossible.
Whereas a few hours of direct behavioural observation would probably tell us a
What's the point of even having physicists if they can't develop something as
simple as time
> 2011/4/27 firstname.lastname@example.org <email@example.com>:
> > From: Ben Creisler
> > 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.
Spatial Data Analyst Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj