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Re: Archaeopteryx or Velociraptor (I'm back...)...

In a message dated 97-07-04 09:01:53 EDT, LemmingGuy@aol.com writes:

<< Actually, it looks to me like
 dromaeosaurs could have evolved from Archaeopteryx (this is off of the
 subject, but its odd that the body types of Velociraptor and Deinonychus are
 so similar, and yet their skulls are comparitively quite different).
 dromaeosaurs and other dinos, as well as birds, evolved from Archaeopteryx.
  Dromaeosaurs probably either evolved from birds or evolved into birds, or
 probably even both!  >>

The skull of Archaeopteryx in almost all recent reconstructions is too
birdlike for Archaeopteryx to be ancestral to dromaeosaurids--unless you
hypothesize a number of difficult reversals, such as reappearance of the
postorbital bar and reseparation of the temporal and orbital openings. So
dromaeosaurids diverged from the bird lineage before archaeopterygids.