[Taxacom] Paraphyletic groups as natural units of biological classification

Laurent Raty l.raty at skynet.be
Sat Oct 4 02:41:40 CDT 2014

On 10/03/2014 11:49 PM, Stephen Thorpe wrote:
> Not necessarily! There might be a monophyletic group consisting of two sister species (or two sister taxa, one of which is a single species). Choose any one, and the residue is monophyletic!

A "group consisting of two sister species" cannot be monophyletic.
(This definition excludes the common ancestor.)

Laurent -

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