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Re: What group has the most work that needs to be done?

<Non-hadrosauriform ornithopods? In a sense we have no idea what
*Hypsilophodon* is...>

It's a hypsilophodontid ornithopod.

That's true -- by definition. And this doesn't tell us anything. We don't have a good idea currently on whether anything else is a hypsilophodontid, respectively where else all those hypsilophodontids in the classical sense are on the ornithopod, wait, cerapod tree.