Diatom ID!

arturoag75 · Post by **arturoag75** » Fri Jan 21, 2011 6:25 am

Hi everybody,
do you know genera of this diatom?
best
arturo

obj.40x DIC illumination on Zeiss Photomicroscope III!

BJ · Post by BJ » Fri Jan 21, 2011 9:59 am

Hi Arturo,

a nice crisp photo.

I think that it is a species of Cocconeis.

It looks rather like the non-raphe valve of C. pseudomarginata (which is marine) . I do not think that it is actually this species, but something similar.

I think René will be the best one to name this for you.

regards

Brian

René · Post by **René** » Fri Jan 21, 2011 1:05 pm

Ha! I'm mostly into planktonic stuff, and this is surely not something in the watercolumn. And I have never seen it. But I think BJ is right, C.pseudomarginata comes close. You can see the raphe on the other side, out of focus.
Images in Witkowski show it with a clear ridge, which is probably lost here during stacking. Real shame to lose infomation like this. Hopefully, with the introduction of 3D screens this will be taken on board...

Well spotted, Brian!

Rene

ps, check the diatom loir site at http://www.diatomloir.eu/Site%20Diatom/ ... odeux.html
A good detail image of the raphe could get us closer

arturoag75 · Post by **arturoag75** » Sat Jan 22, 2011 12:52 am

Brian , Renè,
many thanks for your help!
best days
Arturo

Jean-marc · Post by **Jean-marc** » Sat Jan 22, 2011 3:06 pm

Hi Arturo,

Beautiful !

JM