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This person might be able to help you.
http://www.ansp.org/~potapova/

Marina Potapova joined the Diatom Herbarium in January, 2008. She  
studies taxonomy, ecology, and biogeography of freshwater diatoms. She  
has extensive experience in using diatoms for water quality assessment  
and through that experience she came to appreciate the magnitude of  
the problems in diatom taxonomy. Dr. Potapova is interested in  
understanding the patterns of speciation in diatoms, and developing  
tools for their reliable identification. Her short-term goals include  
cataloguing diversity of the freshwater diatoms of the continental  
United States, developing ways of quantifying morphological characters  
of diatom frustule based on geometric morphometrics, and studying  
taxonomy and systematics of monoraphid freshwater diatoms.





On Jul 22, 2010, at 11:38 AM, Ben Burress wrote:

> diatom species Pseudostaurosira Zeilleri.


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