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eggshells, therizinosaurs & tyrannosaurs
Thanks for the information. Unfortunately our university doesn't have
anything by Ken Carpenter except his 1990 book on dinosaur systematics.
But so far, it sounds as though the "ornithoid" eggshell morphology is
characteristic of primitive birds (including enantiornithines and living
ratites) and the "non-avian" maniraptoran theropods (troodonts and
oviraptors, and presumably dromaeosaurs by inference).
Since Therizinosaurs have the primitive dinosauroid eggshells, this
seems to support Sereno's exclusion of that group from Maniraptora. If
Sereno is correct in placing tyrannosaurs as the immediate outgroup of the
Maniraptora (sensu stricto), then tyrannosaur eggshells could be primitive,
ornithoid, or something in between (transitional).
What are the odds that tyrannosaur eggs will be discovered anytime
soon, and any guesses how big their eggs would be? Maybe canteloupe-sized?
Or if oblong, perhaps more like a very large potato? Or am I thinking too
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