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synapsids (was RE: pdf request)



If a synapsid condition really is primitive for amniotes, is there any chance 
that some animals presently classified as basal synapsids are actually closer 
to sauropsids, or basal to the sauropsid-synapsid split? 

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> Date: Tue, 12 Jun 2012 09:52:13 -0700
> From: keesey@gmail.com
> To: dinosaur@usc.edu
> Subject: Re: pdf request
>
> On Tue, Jun 12, 2012 at 9:25 AM, <tyazbeck@comcast.net> wrote:
> > Anyone have the new paper on Mesosaurus being a synapsid available? Other 
> > references on the mesosaurs would be good too. THanks in advance
>
> Citation:
>
> Pineiro, G., J. Ferigolo, A. Ramos & M. Laurin (in press). Cranial
> morphology of the Early Permian mesosaurid Mesosaurus tenuidens and
> the evolution of the lower temporal fenestration reassessed. Comptes
> Rendus Palevol. doi:10.1016/j.crpv.2012.02.001
>
> It reports a lower temporal fenestra (i.e., the synapsid condition) in
> Mesosaurus, but it does not say it is a synapsid (i.e., part of the
> mammalian total clade). Instead, it suggests that the synapsid
> condition may be primitive for Amniota, and defers further discussion
> to a future study, in progress.
>
> (Yes, it's confusing that being a synapsid and having the synapsid
> condition do not mean the same thing, but that's the terminology.)
> --
> T. Michael Keesey
> http://tmkeesey.net/