Re: Ornithodira, breathing with long necks

["Rob Gay" <rob_redwing@hotmail.com>]

> The living outgroup to _Dinosauromorpha_ (_Crocodylia_) have four-chambered 
> hearts, as do extant _Dinosauromorpha_ (_Neornithes_), so four chambers 
> should be the default assumption.<
Doh! Phylogenetic bracketing...

> As for avian-style (technically, neornithean-style) lungs, might 
> pneumaticity in the skeleton be some indication for this? (air sacs)<
Double doh! I hate it when I forget important things (especially since we're 
discussing air sacs!). Brain fart, sorry about that one.
Peace,
Rob

Student of Geology
Northern Arizona University
P.O. Box 20840
Flagstaff, Az. 86011
AIM: TarryAGoat
"A _Coelophysis_ with feathers?"

_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com