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Re: Modern name for the diatom 'van Heurckia louisiana'?

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  • pennine56
    Hello Dick Many thanks for the very useful and clear taxonomy information. I ll keep an eye out for a prepared slide of the species as am interested in
    Message 1 of 3 , Apr 19 11:00 AM
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      Hello Dick

      Many thanks for the very useful and clear taxonomy information. I'll keep an eye out for a prepared slide of the species as am interested in compiling the set of species which Spitta referred to and photographed so well. His photography is very humbling!

      with regards
      David

      --- In diatom_forum@yahoogroups.com, Richard Carter <rcarter68502@...> wrote:
      >
      > David,
      >
      > I think you are referring to Vanheurckia lewisiana(Greville) Brébisson.  As for the correct modern name, this is a bit of a can of worms!  Most diatomists seem to use the name Frickea lewisiana(Greville) Heiden in Schmidt.  If you look up the two genus names in the CAS database, you'll see the history.  They have the same generotype, basionym Navicula lewisianaGreville 1863.  The catalog suggests that both names are validly published, but that Frickeais a superfluous junior synonym.  Patrick and Reimer (1966) use Frickea, however.  (Which they misspell as Frickia, a definite no-no.)  At one time Vanheurckiawas officially rejected by the ICBN, which conserved Frustulia.  If we agree that lewisianais nota member of Frustulia, however, then it would appear that Vanheurckiais the correct generic name.
      >
      >
      > Hope this helps,
      >
      > Dick
      >
      >
      >
      > ________________________________
      > From: pennine56 <pennine56@...>
      > To: diatom_forum@yahoogroups.com
      > Sent: Thursday, April 19, 2012 7:13 AM
      > Subject: [diatom_forum] Modern name for the diatom 'van Heurckia louisiana'?
      >
      >
      >  
      > Hello
      >
      > Does anyone know the modern name for the diatom 'van Heurckia louisiana' as described by Edmund Spitta as a test object in his classic textbook 'Microscopy ...' 1907 and later editions.
      >
      > He shows a part image of the frustule with caption at link below but not enough for my admittedly basic ID skills to judge what it may be.
      >
      > http://archive.org/stream/microscopyconst00spitgoog#page/n554/mode/2up
      >
      > I can't find the genus in online or offline databases I have access to. Google Books only comes up with Spitta's book as a source.
      >
      > Thanks for any insight.
      >
      > regards
      > David
      >
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