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Re: Greg Paul is right (again); or "Archie's not a birdy"
Provided a clean dichotomy. Our analyses by necessity treat "species"
as individuals with zero dimension in space and time. This assumption
is usually accurate enough (at least for nonmolecular datasets), but
there is no guarantee it is correct. And for paleontological
datasets, it is usually not even testable.
Besides, the neontological experience is that nodes as dichotomies
may be more fiction than fact - not always, but often (alternatively:
that nodes as dichotomies are arbitrary and evolutionary quite
http://sysbio.oxfordjournals.org/content/57/5/719.full It is unlikely
that this is a recent phenomenon.
But, you know, a million years or three of extinction make it look like
a clean dichotomy in the vast majority of cases, and 100 Ma most
Besides, the PhyloCode has two articles that deal with reticulation and
hybridogenesis. They are problems for phylogenetics, but not for
nomenclature (and they aren't intractable problems for phylogenetics
And finally, our knowledge of "species" of Mesozoic dinosaurs usually
_is_ restricted to a single individual. :-)