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Re: Removing segnosaurs from Theropoda



In a message dated 95-08-29 11:13:00 EDT, jdharris@lust.isem.smu.edu (Jerry
D. Harris) writes:

>       Just out of curiousity, George:  _Archaeopteryx_ has interdental
>plates, if I recall correctly, and if you're postulating that birds arose
>from some "thecodontian" ancestor even earlier than _Herrerasaurus_, then
>one could just as easily argue that this early appearance of interdental
>plates is a synapomorphy linking therizinosaurs and birds, making them
>sister taxa.  Do you want to go that far, as well?  ;-)

That's only half the story. Along the lineage from thecodontians to birds,
all the dinosaurs from brontosaurs to theropods arise as divergent side
groups. Birds are not separate from theropods and theropodomorphs in
BCF--they're right in the middle of it, literally.