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hypocleidium (an interclavicle???)



Dear All,
Is the hypocleidium found in nearly all Pygostylia (or are there a lot of exceptions?), and is it homologous to the "hypocleidium" found in Oviraptor and Bambiraptor (any other non-pygostylians with it)?
And are either or both of these homologous to the interclavicle (or is that an old idea that has definitely been disproven)?
----TGIF, Ken


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