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Date: Sat, 29 Jul 2000 12:14:36 -0400
From: Kevin de Queiroz <Dequeiroz.Kevin@NMNH.SI.EDU>
To: PhyloCode@ouvaxa.cats.ohiou.edu
Subject: Re: Stem-based taxon definitions
Jonathan R. Wagner wrote: >This [wording] avoids the problem of potential polyphyly in the traditional "X and all taxa sharing a more recent common ancestor with X than with Y" phrasing, as well as avoids the slight ambiguity I see in formulations involving the phrase "the most inclusive clade." Perhaps I missed something. I don't see how the first phrasing could end up causing a name to be associated with a polyphyletic taxon, nor do I see any ambiguity with the seond phrasing. I can imagine that there could be problems with either of these types of wordings if there are problems with the specifiers (X and Y in the examples), but these problems would also seem to apply to Wagner's proposed alternative phrasing. Kevin de Queiroz 29 July 2000