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Re: Eocursor, new basal ornithischian
Sacisaurus + Silesaurus are dinosauriforms
(Dinosaurs, too, are dinosauriforms by definition.)
The characters in these taxa that
supposedly support a relationship with the ornithischia are based on
characters which can be homoplastic.
That's true, but everything can be homoplastic. Parsimony -- the
minimization of the assumption of convergence -- is what (currently) keeps
*Silesaurus* out of Dinosauria and Ornithischia.
Are there any other characters that support a Sacisaurus/Silesaurus +
Ornithischia relationship to the exclusion of other dinosauriforms?
Yes, just not enough. One is the ability to pronate the forearm and thus to
walk quadrupedally with vertical forelimbs.