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RE: The Dinosauria 2nd Ed. - Saurischia taxonomy and phylogeny


So, following this phylogeny, Ornithischia is basal to Sauropodomorpha and thus to Theropoda?
Where did I miss the thing?

You just misunderstood "basal". All the cladogram says is that Ornithischia is the sistergroup to (Prosauropoda + Theropoda).