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Quick cladistics question



   Here's a cladistics question I do not recall ever being addressed:

   Dinosauria is defined as the most recent common ancestor of _Triceratops_
and modern birds.

   What happens if birds were to, for example, be found to have evolved from
a crocodile?  Would clade Dinosauria be moved down the line to be
synonomized with what appears as the clade uniting ornithodira and
crurotarsi in Weishampel's book?  Would the Dinosauria be redifined?  Would
it be dumped as a polyphyletic group?

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