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Questions , Questions ,Questions

I've got a few questions that's been bugging me .
1. How compelling is the evidence for a monophyletic Ceratosauria ?
2. Is there any evidence to indicate that Ceratosaurus may indeed be a
basal Abelisaur?
3. Is there any evidence of a ' subnarial gap ' in any other theropods
groups outside of Coelophysoidea and Spinosauridae ?
Any help would be greatly appreciated !
Thanks in advance , 
Truett Garner