[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Nick Pharris wrote:
So were basal titanosauriforms all as high-shouldered as _B. altithorax_
_G. brancai_, with later titanosaurs re-equalizing their limb lengths?
Here's what I think. _Brachiosaurus_ (and maybe _Giraffatitan_ - and
_Euhelopus_ too?) may represent a branch of basal titanosauriforms that
became very high-shouldered, due to elongation of the forelimbs (especially
the humerus). They also show the anterodorsal inclination of the sacrum
associated with this sloping from shoulders to hips. Curiously, this foward
and upward "tilting" of the sacral axis is seen in _all_ titanosauriforms,
even those (like true titanosaurids) which have approximately equal fore-
and hindlimb lengths. This means that their backs must have gently arced
from the shoulders to the hips.
it not entirely certain that both _B._ and _G._ were as high-shouldered as
I think it's OK for _B. altithorax_, but I'm not sure about _Giraffatitan_
or those poorly known Wealden "brachiosaurs" (_Pelorosaurus_ etc).
Get Your Private, Free Email at http://www.hotmail.com