Clades, cladons, and "cladifications"

[pierre deleporte]

>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 
>is either
>based on the tree topology or the degree of divergence not both at the same
>time. Ken disagrees, of course.
>
>Herb


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 
another.

I don't mean it is not utilizable, I mean that there are two systems. It 
cannot logically be otherwise.

Pierre


Pierre Deleporte
CNRS UMR 6552 - Station Biologique de Paimpont
F-35380 Paimpont   FRANCE
Téléphone : 02 99 61 81 66
Télécopie : 02 99 61 81 88