[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: flying Archie
On 9/24/06, Tim Williams <firstname.lastname@example.org> wrote:
Good points, but...
This could have been one selective pressure that kept _Archaeopteryx_ in its
plesiomorphic coleurosaurian body plan.
Why does selective pressure need to be invoked? This is the earliest
known winged theropod, and it's probably not too far removed,
chronologically, from the very first ones. Long tails are just the
ancestral state--perhaps there had not been enough time to "evolve out
(And, actually, _Archaeopteryx_' tail is rather reduced compared to
other theropods of the time.)
T. Michael Keesey
The Dinosauricon: http://dino.lm.com
Parry & Carney: http://parryandcarney.com