[Taxacom] New Paper on Mollusca

Ken Kinman kinman at hotmail.com
Sat Jan 19 15:20:29 CST 2013





Hi John,
      By taxonomic placement, I assume he is referring to placement in a subgenus (Ellicea or Aeneator), and/or relationships of species within each subgenus (or even the erection of a new subgenus or separate new genus, as he mentioned).  The future work may be published separately for DNA and morphological studies, perhaps even by different workers, in which case the issue of combining them would not come up (at least not immediately). 
      If it were to be done in one big study, one could certainly analyze the data for both separate and combined data sets.  And, of course, there would be no fossil taxa in the DNA data set.  I don't really see much of a problem with his statement being overly ambiguous in the context of the present paper.  Also, I'm not sure maps would have been all that informative since the purpose of the paper was limited mainly to Chilean species.  Maps would certainly not have been as informative as the photographs, descriptions, comparisons, and keys.  Once the wider DNA and morphological studies are done, then mapping the South American, Antarctic, and New Zealand distributions would certainly be informative.  Especially if Antarctica played a primary role in the overall distribution of the genus.   
          --------------- Ken
------------------------------------------------------------------------------------------------------------------
> Date: Sat, 19 Jan 2013 09:45:45 -0500
> From: calabar.john at gmail.com
> To: taxacom at mailman.nhm.ku.edu
> Subject: Re: [Taxacom] New Paper on Mollusca
> 
> I thought this was nice paper, although I am not a mollusk specialist. A
> couple of comments for future consideration. I found it a little
> frustrating that there were not distribution maps. This might not matter
> for those familiar with the group or the region but otherwise makes the
> information less accessible. Also, since the point was made that the genus
> occurred in Chile and 'New Zealand', a map of that
> overall distribution could have been informative since the countries are
> just name tags rather than defining a distribution.
> 
> Lastly, there is the comment that "Further study of radular characters,
> comparative anatomy and DNA will improve the taxonomic placement of the
> Chilean species." This is ambiguous. What does the author really mean. How
> will the addition of 'DNA' (base pair sequence mating?) improve the
> taxonomic placement? Does the author believe in combining morphogenetic and
> molecular data to get the "improved" result? Without the specifics the
> statement becomes a rhetorical device that does not really contain
>  information.
> 
> Also, if one is combining morphogenetic and molecular data for living taxa,
> how does one really integrate fossils that are limited to morphogenetic
> characters, especially if a combined approach renders all the morphology
> incongruent with the preferred tree that is only supported by molecular
> data?
> 
> John Grehan
> 
> On Tue, Jan 15, 2013 at 7:55 PM, Juan Francisco Araya
> <jfaraya at u.uchile.cl>wrote:
> 
> > Hello to All:
> >
> > I have been just published; my paper is about a new species of
> > *Aeneator*(Mollusca: Buccinidae), a deep water gastropod from northern
> > Chile. You can
> > find it at (it is open access):
> >
> >
> > http://www.pensoft.net/journals/zookeys/article/4446/a-new-species-of-aeneator-finlay-1926-mollusca-gastropoda-buccinidae-from-northern-chile-with-comments-on-the-genus-and-
> >
> > Regards,
> >
> > Juan Francisco.
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