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theropod-bird eggshells

I'm trying to find more details about the "ornithoid" type of eggshell which is supposedly shared by theropods and ratites (and neognath birds as well?).
Is this ornithoid structure pretty distinctive? And if so, why don't the dinosaurologists emphasize it more? Have Martin or Feduccia ever provided a counterargument to the eggshell evidence?
-------Ken Kinman
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