Phylogenetic trees

Tom DiBenedetto tdib at UMICH.EDU
Tue Feb 25 20:32:42 CST 1997

On Wed, 26 Feb 1997 14:13:45 +1100, Don Colless wrote:

> Tom DiBenedetto wrote:
><I think you are right here,,,derived characters were not of course, a
><novel idea in evolutionary theory, but in the world of systematics,
><the notion that one must rigorously discriminate between apomorphy
><and plesiomorphy when reconstructing a phylogeny, was crucial.
>     Curiously, this is not directly true in most modern applications of
>phylogenetic reconstruction. Using, e.g., PAUP, one inserts an outgroup to
>provide a root and the apomorphies and plesiomorphies are read off afterwards!

I dont consider the careful choice of an outgroup to be a
non-rigorous approach to discriminating between the two types of

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