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Euhadrosauria and Psittacosauria question

Who introduced Euhadrosauria? it was Weishampel et al.
1993? I have the paper and Euhadrosauria appears in
his phylogeny but no introduction is given to the
Another question, who created Psittacosauria? does it
really exist? in google I see Psittacosauria Osborn
1923 but that's not true, he created only

Thanks in advance

Mark Van Tomme

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