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Re: justification for excluding lagerpetids and/or pterosaurs from a phylogenetic analysis of the Archosauria
David Peters <firstname.lastname@example.org> wrote:
> Two: Sobral and Langer 2008. All prior works have ignored
> the fenestrasaurs. Right? That's why they were a novelty in
Sobral and Langer (2008) was a supertree, and so can be discounted.
> Also, please be my guest and list the three genus-based
> taxa that lead progressively closer to pterosaurs within the
> archosaurs as determined by the best study out there. I note
> that proterochampsids, erythrosuchids and proterosuchids
> keep making these lists, and I hope you can explain how you
> get pterosaurs to emerge from any of these.
You don't. These archosauriform clades ((proterochampsids, erythrosuchids,
proterosuchids) are recovered outside the Ornithodira+Crurotarsi clade. AFAIK
nobody has claimed that pterosaurs evolved *from* any of these groups.
The most recent phylogenetic analyses recover Pterosauria as the sister taxon
of Dinosauromorpha, in a clade called Ornithodira (=Avemetatarsalia).
Consequently, any characters that are shared exclusively between pterosaurs and
any non-ornithodiran clade are either plesiomorphic (and were therefore lost by
dinosauromorphs) or arose independently (i.e., they are homoplasies). This is
not my interpretation or opinion: this is what the cladogram says.