[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Hibernating Dinosaurs?




Phil Bigelow wrote:
> 
> On Sat, 19 Mar 2005 09:16:23 +1100 Dann Pigdon <dannj@alphalink.com.au>
> writes:
> 
> > It's not just the size of the eye sockets; an endocast of a
> > Leallynasaura brain also shows enlarged optic lobes.
> 
> Enlarged compared to what other species?  Does the paper mention the
> comparison cranial material?
>

To quote the figure on page 57 of 'Dinosaurs of Darkness':

"Its large size relative to the optic lobes of hypsilophodontid
dinosaurs from lower palaeolatitudes suggests that Leaellynasaura
amicagraphica had unusually high visual acuity".

As to which other species were compared - you'd have to go back to the
original description. Apparently there are at least four other preserved
hypsie endocasts in other parts of the world (according to page 61). All
have significantly smaller optic lobes.

-- 
___________________________________________________________________

Dann Pigdon
GIS / Archaeologist         http://www.geocities.com/dannsdinosaurs
Melbourne, Australia        http://heretichides.soffiles.com
___________________________________________________________________