[Taxacom] Paraphyletic groups as natural units of biological classification
stephen_thorpe at yahoo.co.nz
Thu Oct 2 23:41:35 CDT 2014
Yes Curtis, I know what the word 'plesiomorphic' means. I do not understand your last sentence: Any time a species forms, it leaves behind a paraphyletic residue of whatever monophyletic group you choose.
On Fri, 3/10/14, Curtis Clark <lists at curtisclark.org> wrote:
Subject: Re: [Taxacom] Paraphyletic groups as natural units of biological classification
To: "taxacom at mailman.nhm.ku.edu" <taxacom at mailman.nhm.ku.edu>
Received: Friday, 3 October, 2014, 4:36 PM
On 2014-10-01 11:09 PM,
Stephen Thorpe wrote:
> That was uncalled
for! I was trying to articulate an idea. If my terminology
wuz in some way inappropriate, I apologise, but it was
Sorry, but "plesiomorphic species"
rubs me the wrong way. Characters (or
precisely character states) are plesiomorphic.
> Let me rephrase it in the
form of a question: do you think it is common (or even
possible) for a monophyletic group (M) to evolve quickly
(within a larger monophylum), leaving only a remainder of
plesiomorphic species which are very similar to each other,
but very different to M?
This is not an issue of science, but of
terminology. Since monophyletic
monophyletic, they have a single ancestral species, so
talking about speciation when
that species splits from whatever. The
residue of species in the (now paraphyletic)
group made by the exclusion
monophyletic group will of course have similarities that the
monophyletic group doesn't share. They
are called plesiomorphies; that's
the word means. Any time a species forms, it leaves behind a
paraphyletic residue of whatever
monophyletic group you choose.
Curtis Clark http://www.csupomona.edu/~jcclark
+1 909 869 4140
Pomona, Pomona CA 91768
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