Darwin (was: Phylogenetic evidence)
skala at INCOMA.CZ
Thu Jul 25 16:15:54 CDT 2002
From: Richard Jensen
If I take this literally, then you are arguing that there can exist a clade in which the objects have absolutely nothing in common ("...members do not share any character state in common..."). If that's the case, then the "clade" does not exist - it cannot be supported by any evidence and, in my mind, consists of two mutually exclusive classes of unknown affinity.
Can you provide an example of such a clade?
Um, am I wrong here? What about the character matrix (+ = apomorphy)
1 2 3 4 5 6 7 8
A - + + + + + + +
B + - + + + + + +
C + + - + - - + +
D + + + - - - - -
... does not it result in a cladogram (((AB)C)D) ? If yes (and perhaps I am missing something here), then we have a clade ABCD where the species do not share any single common character state.
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