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Could any provide information regarding the embryological origin of the
predentary bone. Did it arise de novo in the ornithischians or did it have a
homolog that can be detected in ancestral forms. Are there any studies on
the trends of the origins and fixation of neoostia in dinosaurs. Further
regarding ornithishchian osteoderms: are there any reasons to assume the
real homology of those in Scutellosaurus to those in the later Thyreophora.
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