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As for the relationship between Ceratosaurus, coelophysoids, abelisauroids,
and tetanurans, I would say that while coelophysoids are probably a
paraphyletic group leading up to (neo)Ceratosauria/Tetanurae, abelisauroids
still can be grouped with Ceratosaurus, as osteoderms were found in both
Ceratosaurus and Carnotaurus, but not, to my knowledge, in any tetanuran for
which skin impressions are known.