[Taxacom] dinosaurs and wolves

Kirk Fitzhugh kfitzhugh at nhm.org
Wed Oct 3 20:01:07 CDT 2012


Ken,

Para- and monophyly refer to divergent views on conveying particular 
sets of causal events implied by cladograms. To that end, monophyly is 
the accurate representation of our (vague) answers to why-questions. ...K

On 10/3/2012 5:51 PM, Ken Kinman wrote:
> Hi Kirk,
>
>         What about  phylogenetic analyses and trees sensu Peter 
> Ashlock which allow paraphyly (in addition to holophyly).  Would you 
> regard them as less vague and therefore more informative and more of 
> an accomplishment?
>
>                   -------------------Ken
>
> --------------------------------------------------------------------------------------------
> > Date: Wed, 3 Oct 2012 17:24:39 -0700
> > From: kfitzhugh at nhm.org
> > To: calabar.john at gmail.com
> > CC: taxacom at mailman.nhm.ku.edu
> > Subject: Re: [Taxacom] dinosaurs and wolves
> >
> > I deny that our goal is to get 'trees.' Per the goal of science, we 
> seek
> > causal understanding of the phenomena we encounter. Vague 
> understanding,
> > sensu 'trees', isn't much of an accomplishment. ...K
> >
> > On 10/3/2012 5:17 PM, John Grehan wrote:
> > >
> > > On Wed, Oct 3, 2012 at 4:00 PM, Kirk Fitzhugh <kfitzhugh at nhm.org
> > > <mailto:kfitzhugh at nhm.org>> wrote:
> > >
> > > Hi Pierre,
> > >
> > > Cladograms are nothing more than abstract devices that imply very
> > > vague
> > > causal accounts of character origin/fixation in ancestral populations
> > > and subsequent population splitting events.
> > >
> > >
> > >
> > > But perhaps no more 'vague' than any other tree building device?
> > >
> > > John Grehan
> >
> > --
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > J. Kirk Fitzhugh, Ph.D.
> > Curator of Polychaetes
> > Invertebrate Zoology Section
> > Research & Collections Branch
> > Natural History Museum of Los Angeles County
> > 900 Exposition Blvd
> > Los Angeles CA 90007
> > Phone: 213-763-3233
> > FAX: 213-746-2999
> > e-mail: kfitzhug at nhm.org
> > http://www.nhm.org/site/research-collections/polychaetous-annelids
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
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> >
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
J. Kirk Fitzhugh, Ph.D.
Curator of Polychaetes
Invertebrate Zoology Section
Research & Collections Branch
Natural History Museum of Los Angeles County
900 Exposition Blvd
Los Angeles CA 90007
Phone: 213-763-3233
FAX: 213-746-2999
e-mail: kfitzhug at nhm.org
http://www.nhm.org/site/research-collections/polychaetous-annelids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




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