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Tim Williams wrote:
> Ahh yes, I forgot about that one. Its crests are somehwat bulkier
> than those of its cousin from Arizona. But the point still stands.
> Among theropods, paired cranial crests are known only for
> coelophysoid species (two Dilophosaurus species, one Syntarsus
> species), so I'd be surprised if it wasn't a synapomorphy for a
> clade within the Ceratosauria.
Of course that still leaves the possiblity of later loss, so absence,
per se, is insufficient to exclude something from that clade. Additional
analysis would be necessary to establish that.
The peace of God be with you.