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RE: Maidment & Wei, 2006

> Well, since no one has replied yet, I'll give it a go. 
> I think your main area of misunderstanding is that there is
> a difference between the number of diagnosable species and
> the number of actual species we have remains of.

Another example: _Ichthyornis_. A single species is generally considered valid 
nowadays, due to lack of consistent differences between specimens. But the 
temporal range is so large as to render this provisional at best.


Eike


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