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Re: An Elaphrosaurus question and request
Adam (firstname.lastname@example.org) wrote:
> Hmmm...Ozraptor the abelisauroid? That's kind of cool.
> If the American "Elaphrosaurus" is indeed a
> similar abelisauroid, it seems like there was a
> low-key-but-worldwide radiation of leggy abelisauroids
> before the more familiar noasaurid-abelisaurid clade took
> hold. I wonder how much old Jurassic
> "coelurosaur" material is nothing of the kind.
The erstwhile coelurosaur _Chuandongocoelurus_ (Middle Jurassic) has been
mooted as a possible ceratosaur. However, a recent phylogenetic analysis
recovered it as a basal tetanuran. The situation is muddied by the possibly
chimeric nature of the _C. primitivus_ type specimen.
An isolated premaxilla from the Morrison Formation may represent a new Late
Jurassic ceratosaur. This premaxilla (UUVP 2999) was originally referred to
_Stokesosaurus_, and then to _Tanycolagreus_ (both coelurosaurs). However,
Benson (2008) suggests that the premaxilla belongs to neither of these, and
pertains to a ceratosaur instead. It can't belong to _Ceratosaurus_, which has
three, not four, teeth per premaxilla. (No mention of _Elaphrosaurus_, also
known from the Morrison.)