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Re: large theropod body config and predation



dunn1@IDT.NET wrote:
> 
> > From:          "Thomas R. Holtz, Jr." <th81@umail.umd.edu>
> 
> >
> > Sauropods remained fairly common well into the Cretaceous in many (most?)
> > parts of the world.  It is only the Late Cretaceous of North America which
> > was, apparently, sauropod free (until the arrival of Alamosaurus, at least).
> > Even Asia had sauropods in the Late Cretaceous, albeit at reduced numbers
> > relative to earlier.
> 
> Are the Car'ids believed to have preyed upon sauropods?  How does one
> explain the difference in teeth between the Car'idae and the
> Tyr'idae? Was it driven by selection or simply a development of what
> earlier forms offered?  I am trying to understand the difference in
> the "lifestyles" (if I can be so bold) between the Tyrannosauridae
> and the Carcharodontosauridae -- does the answer lie in the
> teeth?

        I think in part. The Carchs. could hold their prey while they 
sliced them up (blades). T. rex had to bit and rip (a steam shovel of a 
mouth). Look Ma, no hands .

Jim K.