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>From:
owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of Guy
Leahy
> Henri,
>
>
The relationship between various airsacs and those bones the airsacs invade is
very consistent, regardless of which
> bird is being
discussed.
> Some theropods
(oviraptorosaurs, _Acrocanthosaurus_, perhaps others;
> I'm in the process
of moving and all of my refs are boxed) exhibit pneumatic foramina in the
sacrum, pelvis and/or caudals.
> Assuming the
relationship between theropod airsacs and the bones they aerate was the same as
it is in birds, this
> suggests some
theropods possessed abdominal airsacs.
The
(lost) Carcharodontosaurus type had caudal centra with pleurocoels; at
least some tyrannosaurid sacra also have pleurocoels.
Thomas R. Holtz,
Jr. |