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RE: What group has the most work that needs to be done?
Quoting "Thomas R. Holtz, Jr." <firstname.lastname@example.org>:
> Are maginocephalians closer to Iguanodon than is Hypsilophodon? Maybe. Are
> the Middle Jurassic "hypsilophodontians" actually ornithopods? Hard to say
> at present.
And, of course, where do heterodontosaurs fit into all this mess?
Department of Linguistics
University of Michigan