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Re: Ichthyosaur breathing
Jaime Headden wrote:
*Hupehsuchus* and *Utatsusaurus* are considered the most basal
ichthyopterygians, and in fact Motani places the former at the root, with
*Utatsusaurus* more crownward.
So, under Motani's phylogenetic definition, _Utatsusaurus_ is an
ichthyopterygian, but _Hupehsuchus_ is not. Nevertheless, _Hupehsuchus_ is
recovered as the sister taxon to Ichthyopterygia.
I've seen the term Ichthyosauromorpha proposed for the ichthyosaur stem
clade, but I'm not aware that this has ever received a formal definition.
In any case, _Hupehsuchus_ would be a non-ichthyopterygian
Thanks for the info.