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Re: Re: Removing segnosaurs from Theropoda
>From: Thomas_R_HOLTZ@umail.umd.edu (th81)
> >And, pray, what other name is available for stem-archosaurs?
> Nonmonophyletic groups do not need to be named.
That is where we disagree. I think they do. So does Olshevsky.
> "Thecodontia" as commonly used is a doubly (or even triply)-paraphyletic
Yep. As I defined it in the previous message it is triply para-
phyletic. Defined as George Olshevsky does, it is doubly so.
> Under most archosaur workers phylogenies, the majority of the classical
> "thecodonts" (rauisuchids, aetosaurs, parasuchians, etc.) are recognized as
> sharing a more recent common ancestor with crocodiles than with the dinosaur
> (bird) + pterosaur clade. This group is called Pseudosuchia, or (for those
> who'd prefer crocodiles not be among the "false crocs") Crurotarsi.
I would make the Pseudosuchia one of the orders within Thecodontia.
[But defined as a paraphyletic group, excluding the crocodiliforms].
The peace of God be with you.