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Elmisaurids (was Re: Dinosaur Web Pages' Re-Opening)
In a message dated 97-09-04 15:54:28 EDT, email@example.com writes:
<< >one. _Mononykus_ can't be a bird because, like _Avimimus_, it doesn't
>avian metatarsus; it has an arctometatarsalian metatarsus.
As do the non-arctomet elmisaurids. Indeed, there seems to be a
tendancy in all coelurosaurs towads a compressed MT III, and in at least two
groups, towards a more slender metatarsus. >>
All this means is that elmisaurids aren't birds, either. The
arctometatarsalian metatarsus is actually >derived< with respect to the avian
metatarsus (_Archaeopteryx_ does not have an arctomet metatarsus). It may
indeed have arisen more than once.