marine diatoms

Franz Neidl · Post by **Franz Neidl** » Sat Jul 03, 2010 2:49 am

During spring time I found several species of marine diatoms. I show you 6 pictures in DIC. I dont know the species.

Franz

1.

2.

3.

4.

5.

6.

Pau · Post by **Pau** » Sat Jul 03, 2010 2:58 am

Excellent photos
I like in special n3

Craig Gerard · Post by **Craig Gerard** » Sat Jul 03, 2010 4:17 am

Superb Franz!

I like the 'embossed' effect that DIC achieves.

Craig

Gyrosigma · Post by **Gyrosigma** » Sat Jul 03, 2010 7:32 am

Hello Franz,

1 Licmophora flabellata
2 Odontella...???
3 Licmophora flabellata
4 Achnanthes longipes or bevipes
5 Navicula ramosissima or Parlibellus delognei
6 Stephanopyxis palmeriana

Best regards

Dominique

Charles Krebs · Post by **Charles Krebs** » Sat Jul 03, 2010 12:00 pm

Great shots. Love the "tube dweller" (#5), and #3 should be printed up!

René · Post by **René** » Sun Jul 04, 2010 1:32 am

Nice images again, Franz. Dominique already made a couple of suggestions. The Odontella looks indeed strange to me as well (with my Nort Sea only ref.), I wonder whether it is not simply a form of O.aurita.
The Achnanthes (in absense of scale bars) I would regard as A.longipes, see the staurums in the concave valves. The double pore rows are easily visible in A.longipes at higher mag. Franz?
The last image looks like Melosira monoliformis to me, Stephanopyxis has whole different cell connections.

Best wishes, Rene.

Franz Neidl · Post by **Franz Neidl** » Sun Jul 04, 2010 1:44 pm

Many thanks to everybody: to Pau, Craig Gerard, Gyrosigma, Charles and René.

René:

The Achnanthes (in absense of scale bars) I would regard as A.longipes, see the staurums in the concave valves. The double pore rows are easily visible in A.longipes at higher mag. Franz?

I have only this picture with higher magnification (from the same object):
Obj. 40x, eyepiece 2,5x Camera 1,5x
stack with 7 pictures

Franz

René · Post by **René** » Mon Jul 05, 2010 2:29 am

Yep, that's the one! From my own library:

Here's one with my 20x, with roughly the same NA as your lens:

It seems this one does only have the double row of pores in the convex valve, not the concave one.
I've made some more detailed images of this thingy with an oil lens (60X), unfortunately only small bits in focus at the time, but a quick trial with helicon gave so many artefacts that I left it at that.

I've put this thing on the concave side, so you can see the staurum quite well:

Best wishes, Rene

Gyrosigma · Post by **Gyrosigma** » Mon Jul 05, 2010 10:43 pm

Yes, welldone...

and one with CombineZ

Best regards

Dominique

René · Post by **René** » Tue Jul 06, 2010 2:41 am

Nice Dominique, very nice stack.

Best wishes, Rene.