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dated 96-02-09 03:15:19 EST, longrich@phoenix.Princeton.EDU
(Nicholas R. Longrich) writes:
>> Yes, based on foot and braincase features, I believe arctomets (including
>> _Tyrannosaurus_) to be more closely related to modern birds than
>> _Archaeopteryx_, although Tom and George, just to name a few, disagree.
>Okay, so I was reading you right. I assume you mean that they're
>secondarily flightless, rather than a second evolution of flight.
With this I would certainly agree. But the more advanced cursorial
tyrannosaurians, or tyrannosaurids, represent a completely different
direction in theropod evolution from the usual birds _or_ the
archaeopterygiforms (archaeopterygids + dromaeosaurids) _or_ the