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Re: Ah ha! That's where therizinosaurs came from

 fossil paravians like _Archaeopteryx_ and _Microraptor_ (which
 retained a medially-directed hallux)

Oh no. They retain a _cranially_ directed hallux. A medially directed one is found in *Confuciusornis* (and for instance the kiwis).

Somebody should have a look at *Changchengornis* and the scansoriopterygids. The latter have a pretty long and fully descended hallux...