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RE: sauropod necks-buckaroobwana is back! ha ha ha ha ha !!
So, if I understand this correctly, this would signify that Camarasaurus was
completely incapable of drinking water from ground level or below? If the
cervical vertebrae have to be disarticulted just to get the neck horizontal, how
could it go even lower?
So how then did Camarasaurus get the water that it would certainly have needed?
Or is my "would certainly have needed" is error, with dinosaurs having a
non-permeable skin (???), eating vegetable matter with enough water content to
sustain them (???) and expending so little water via waste disposal?
"Jonathan R. Wagner" <znc14@TTACS.TTU.EDU> on 10/08/99 05:36:40 PM
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Subject: RE: sauropod necks-buckaroobwana is back! ha ha ha ha ha !!
Thomas R. Holtz, Jr. wrote:
>It disturbs me that the model does not want to get _Camarasaurus_ necks over
>the horizontal: it was CLEARLY capable of such without disarticulation, as
>documented by numerous fossils in opisthotonic death position: the CMNH
>juvenile, the USNM specimen on display, etc.
Hmm... sounds like someone should wait for the paper... ;)
Actually, you don't have to even to look at death poses. There is a
_Camarasaurus_ mount at an exhibit which has not yet opened which has the
neck mounted in a horizontal pose. The cast is beautiful, and as far as I
know is accurate. In order to mount the neck horizontally, the shoulder
region was arched down, bringing the first few dorsals out of articulation.
Let me clarify, throughout this post, "out of articulation" means that the
zygapophysial facets are not only separated by a significant gap (say, on
the order of 5 cm), but are displaced relative to one another along one or
more axes of rotation. Anyway, in order to get the base of the neck to
extend out at a shallow angle (appears to be around 20-30 degrees from the
horizontal, might be a little more), the caudal cervical vertebrae are out
of articulation (flexed too far ventrally). The middle cervicals are
more-or-less articulated, however the cranial cervicals are again out of
articulation, or at least at the limits of their articulation (flexed
dorsally). What this says to me is that the animal held its neck much more
upright, with at least a slight s-curve.
So, I suppose we'll have to wait and see what the simulations produce.
Jonathan R. Wagner, Dept. of Geosciences, TTU, Lubbock, TX 79409-1053
"Why do I sense we've picked up another pathetic lifeform?" - Obi-Wan Kenobi