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Re: Arctometatarsalia

On Mon, 25 Feb 2002, Jaime A. Headden wrote:

>   Now recently, a lot of people have tried to say that a name that
> includes an apomorphy in it's etymology should, reasonably, include that
> apomorphy as part of its definition, or _as_ it's definition. Hence,
> Gauthier and de Quieroz (2001) revise a decade of use of Carinatae
> {*Ichthyornis* + Neornithes} to turn it into a clade that is, effectively,
> a senior synonym of Ornithodira by defining the taxon on a carinate keeled
> sternum, and define that in such a manner that one can make pterosaurs fit
> it without stretching the imagination.

To belong to _Carinatae_ _sensu_ de Queiroz and Gauthier 2001, the
organism must have a keeled sternum *synapomorphic with that character in
_Vultur gryphus_*. Thus, pterosaurs do not belong, as they developed
keeled sterna separately.

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