cladism's greatest weakness
PIETERW at UNIN.UNORTH.AC.ZA
Fri Sep 17 11:10:23 CDT 1999
The "different nature" of paraphyly at different levels is presented as some sort of obvious truth. I must have missed something. Can anyone elaborate on this? Surely they are both the results of the same process, separated only by time and extinction long after the event?
>>> Curtis Clark <jcclark at CSUPOMONA.EDU> 09/17 8:32 AM >>>
At 07:22 PM 9/16/99 -0700, Ken Kinman wrote:
> Excellent point. This speciation process is called "budding" and is
>quite common. It is probably the true Achilles heel of cladism, even
>though I doubt most cladists realize this weakness.
Even my undergraduates understand that the paraphyly of the protists and
reptilia is of a different nature than the paraphyly of a species that
gives rise to peripheral isolates.
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