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Re: paraphyly (was: Not Monotremes again!)
From: email@example.com (James Shields)
> >[The main argument between cladists and non-cladists is the validity
> >of *para*phyletic taxa].
> Could you explain this a little, please? I presume polyphyletic means "many
> parents" or something like that, but I'm lost on paraphyletic.
monophyletic (sensu Hennig): containing the most recent common ancestor
and *all* (I repeat *all*) descendents of that ancestor.
(Peter Ashlock suggested calling this holophyletic, meaning
paraphyletic: containing the most recent common ancestor, but NOT
all of its descendents (aka "partial branch").
polyphyletic: NOT containing the most recent common ancestor.
(from "many branched").
An alternate definition of monophyletic that is now moribund used
to include both "holophyletic" and paraphyletic.
The peace of God be with you.