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a diatom from the Mediterranean Sea

 
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Franz Neidl



Joined: 14 Jan 2009
Posts: 747
Location: Italy

PostPosted: Sun Jan 18, 2009 11:09 am    Post subject: a diatom from the Mediterranean Sea Reply with quote

I like very much this species of diatoms. It reminds me to a choklade-cooki.
Could somebody help me by the identification?
I know only it is a member of the Pennates.

Many greatings
Franz


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Gyrosigma



Joined: 04 Aug 2006
Posts: 134
Location: France Normandie

PostPosted: Sun Jan 18, 2009 12:36 pm    Post subject: Reply with quote

Hello Franz

Striatella surely perhaps unipunctata.

Best regards

Dominique
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Ken Ramos



Joined: 27 Jul 2006
Posts: 7078
Location: lat=35.4005&lon=-81.9841

PostPosted: Sun Jan 18, 2009 6:08 pm    Post subject: Reply with quote

Can't help with an ID but it sure reminds me of one of those candy cough drops. Really a nice sharp image. Very Happy
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René



Joined: 08 Oct 2006
Posts: 433

PostPosted: Mon Jan 19, 2009 4:44 am    Post subject: Reply with quote

Not too sure, it might be Pseudostriatella if you look at the rounded corners of the cell, see http://university.uog.edu/botany/474/diatoms/pseudostriatella.htm
Striatella clearly shows truncuation of the corners:

(Netherlands, delta area, 20/0.75)

The other distuinguishing element is the plastid, but your specimen does not show the typically discoid plastids for Pseudostriatella?! The genus is only recently separated from Striatella, Phycologia (2008) 47:371-391.
Nice images!

Rene.
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Gyrosigma



Joined: 04 Aug 2006
Posts: 134
Location: France Normandie

PostPosted: Mon Jan 19, 2009 7:44 am    Post subject: Reply with quote

Welldone René... I didn't know the "pseudostriatella" genus...

looking to the corners of Franz's diatom, you are certainely right, I am not sure that the plastids are very important because they take lot of forms in the different phase during division



best regards

Dominique
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Franz Neidl



Joined: 14 Jan 2009
Posts: 747
Location: Italy

PostPosted: Thu Jan 22, 2009 4:04 am    Post subject: Reply with quote

Thanks a lot to Gyrosigma (Dominique) and Renè for their help in identification!

Franz
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