Clades, cladons, and "cladifications"
pierre.deleporte at UNIV-RENNES1.FR
Mon Jun 14 19:31:59 CDT 2004
>Yes, the number of derived characters can be plotted on the branch showing
>the amount of divergence, but what Hull was trying to say is it cannot be
>expressed in a classification based on tree topology. The classification
>based on the tree topology or the degree of divergence not both at the same
>time. Ken disagrees, of course.
Ken devised a system which gives the impression of mixing the two
incompatible criteria. But this "Kinman system" is composed of two systems:
names give overall similarity distances whe desired (possible paraphyletic
groups based on significant gaps), and codes (letters - numbers) give the
"strict cladist" phylogenetic classifivcation.
"The" Kinman system is two classificatory systems written close to one
I don't mean it is not utilizable, I mean that there are two systems. It
cannot logically be otherwise.
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