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Troodontidae (misfits)

Dear All,
     Just how secure is the holophyly of this Family Troodontidae?  What
else could Sinornithoides be?
     And what about the unserrated teeth in Byronosaurus?  Could this
family be a wastebasket of two or more convergent clades of misfits?  Are
they all really all that bird-like?  [Obviously I haven't given up the idea
that at least some of them might be bullatosaurian relatives of
ornithomimes].
                      ------Ken
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