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Dear Phil,<br>
<br>
I think that you are on the right track. I am guessing that Nico
and Brent will not find that sufficient, but the main purpose is to
improve the code. The new species definition is more neutral. I
would reformulate it slightly, hower, as such:<br>
<br>
A taxonomic unit that is variably
conceptualized as a kind of biological <b>that may be </b>entity
different from a clade...<br>
<br>
Or:<br>
<br>
A taxonomic unit that is variably
conceptualized as a kind of biological entity different from a clade
<b>(although some may happen to be clades as well) </b>or simply
a taxon of low rank in traditional nomenclature.<span
style="mso-spacerun:yes"> </span><br>
<br>
Because some authors (Nico and Brent, apprantely) conceptualize
species as clades, and even if they are conceptualized differently,
some will be clades, by chance. I think that Nico and Brent might
prefer the first option.<br>
<br>
Cheers,<br>
<br>
Michel<br>
<br>
On 13/01/12 21:18, Cantino, Philip wrote:
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<p class="MsoNormal">CPN members,</p>
<p class="MsoNormal">In
considering the Cellinese et al. proposal, I think it is
important to separate
philosophical considerations from practical ones.<span
style="mso-spacerun:yes"> </span>The philosophical premise
underlying their
proposal is stated in their second paragraph:<span
style="mso-spacerun:yes">
</span>“The debate over species concepts does not need to be
solved for the
purpose of naming clades under the PhyloCode.<span
style="mso-spacerun:yes">
</span>Phylogenetic nomenclature can and should remain logically
independent
from the philosophical debate about species.<span
style="mso-spacerun:yes">
</span>Therefore, the PhyloCode need not and should not anoint
any particular
species concept as the correct one. “<span
style="mso-spacerun:yes">
</span>They conclude in the next sentence that “by leaving the
word ‘species’
out of the entire document it will be clear that the PhyloCode
is available to
all systematists regardless of their views on the nature of
species.”</p>
<p class="MsoNormal">I
am sympathetic to their premise that because the PhyloCode
focuses strictly on
the naming of clades, it should not adopt a particular stance on
the nature of
species, but I strongly disagree that the word “species” should
be banished from
the code.<span style="mso-spacerun:yes"> </span>Doing so would
ignore the
reality that the vast majority of biologists (I’d wager 99.9%),
not to mention
most of the general public, use species names and will continue
to do so
regardless what they think a species is.<span
style="mso-spacerun:yes">
</span>If we want the systematics community to use the
PhyloCode, we need to
make it possible for people to define clade names using the
entities they are
most familiar with (species) and to combine species names with
PhyloCode-governed clade names in scientific works and in the
classroom.<span style="mso-spacerun:yes"> </span>If people
have to choose between using
species names and using the PhyloCode, our effort is doomed.</p>
<p class="MsoNormal">There
are certain parts of the Cellinese et al. proposal that I
consider to be
non-starters, most seriously the elimination of Art. 10.9 (see
my previous
message), but we may be able to address their philosophical
concern with
relatively few changes if we broaden the definition of “species”
used in the
code to encompass the breadth of views on this subject but
continue to use the
word “species” (defined in this way) in the rules and
recommendations.<span style="mso-spacerun:yes"> </span>I
discussed this idea today with Kevin and we
jointly prepared the following possible definition (written in
the form that it
would appear in the glossary), which does not endorse any
particular species
concept:</p>
<p class="MsoNormal"><b style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:
normal">species</i></b><b
style="mso-bidi-font-weight:normal">.<span
style="mso-spacerun:yes"> </span>A taxonomic unit that is
variably
conceptualized as a kind of biological entity different from a
clade or simply
a taxon of low rank in traditional nomenclature.<span
style="mso-spacerun:yes"> </span>This code does not
endorse any species
concept nor provide rules for defining species names, but it
uses species names
governed by the rank-based codes to refer to taxa that are
used as specifiers
in definitions of clade names.<span style="mso-spacerun:yes">
</span>Article
21 provides guidelines for the use of species names governed
by the rank-based
codes in conjunction with clade names governed by this code.</b></p>
<div>With this definition in mind, I have started working through
the Cellinese et al. species proposal article by article. I
will send the result to the CPN next week, but if some of you
feel this approach is not viable, please let me know soon so I
don't waste a lot of time working out the details.</div>
<div><br>
</div>
<div>Have a good weekend everyone!</div>
<div><br>
</div>
<div>Phil</div>
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<pre class="moz-signature" cols="72">--
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<a class="moz-txt-link-freetext" href="http://tolweb.org/notes/?note_id=3669">http://tolweb.org/notes/?note_id=3669</a></pre>
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