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Re: The Papers That Ate Cincinnati
On 5/6/07, Tim Williams <email@example.com> wrote:
>Presumably the panclade name would be _Pan-Opisthocomus_ or
>pan-Opisthocomus or something along those lines. It would be
>permissible, e.g., to define _Opisthocomus_ as "_Opisthocomus hoazin_ and
>all of its descendants".
Wouldn't this be a tautology?
Only if _O. hoazin_ goes extinct before giving rise to other species....
>Alternately, you could use _Opisthocomiformes_ for the total group.
Yep, this is my favourite option. Trouble is, like I said, as well as
having _Opisthocomus hoazin_ as the internal specifier, you would have an
extremely long list of external specifiers. You would probably need a
representative of almost every other extant neognath 'order' as an external
specifier, to cater for any and all topologies of modern bird phylogeny.
"Let C be the clade consisting of _Opisthocomus hoazin_ and all
descendants thereof. _Opisthocomiformes_ is defined as the first
ancestor of _O. hoazin_ (and hence of C) which is not also ancestral
to any extant organism outside of C, and all of that first ancestor's