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Arms for a Carnotaurus
On Fri, 3 May 1996, th81 wrote:
> Short, but MASSIVE. Huge muscle attachments. Powerful claws. Not at all
> like the (grotesquely) shortened arms of _Carnotaurus_ (which, incidentally,
> has a very well developed scapulocoracoid: for what,I have no clue).
Speaking of Carnotaurus arms, I've only just got hold of a copy of the
description of this beast published by the LACM. In it the authors state
that the humerus had lost the torsion between the proximal and distal
ends, and that the radius and ulna did not cross as they do in other
theropods. This straightening out of the arm was supposed to have rotated
the orientation of the hand so that the palmar surface faced anteriorly!
(at least that was my understanding of their writing)This seems totally
bizare and I have great trouble imaging how it could work. In Stephen
Czerkas's model it appears that the palms face medially like other
theropods. Has anyone actually seen the fossil or good casts? Which way
is the hand oriented? One other point is that the drawing of metacarpal
IV looks like a large Iguanodontid thumb-spike, yet it is not discussed
in the text. Could Carnotaurus have used its arms for offensive weapons?
(this might explain the increased range of movement at the shoulder joint)
"Smoke me a kipper, I'll be back for breakfast"