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As for lumping or splitting

* it should been done consequently
* it should lead to monophyletic groups only

otherwise, it is largely a matter of taste whether to lump or split.

There is a general tendency for specialists to split and for generalists to lump. So nice to see a counterexample.

As Tschornsig, I have a tendency to be conservative: changes names if they need to be changed, but avoid changing them to and fro, everybody gets lost.

Theo