marine diatoms

Images made through a microscope. All subject types.

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Franz Neidl
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Location: Italy

marine diatoms

Post by Franz Neidl »

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

Franz

1.
Image
2.
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3.
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4.
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5.
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6.
Image

Pau
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Post by Pau »

Excellent photos
I like in special n3
Pau

Craig Gerard
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Location: Australia

Post by Craig Gerard »

Superb Franz!

I like the 'embossed' effect that DIC achieves.

Craig
To use a classic quote from 'Antz' - "I almost know exactly what I'm doing!"

Gyrosigma
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Location: France Normandie
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Post by Gyrosigma »

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
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Post by Charles Krebs »

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

René
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Post by René »

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
Posts: 747
Joined: Wed Jan 14, 2009 11:59 am
Location: Italy

Post by Franz Neidl »

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

Image

René
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Joined: Sun Oct 08, 2006 4:22 am

Post by René »

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

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

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.
Image

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

Image

Best wishes, Rene

Gyrosigma
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Location: France Normandie
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Post by Gyrosigma »

Yes, welldone...

and one with CombineZ

Image

Best regards

Dominique

René
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Joined: Sun Oct 08, 2006 4:22 am

Post by René »

Nice Dominique, very nice stack.

Best wishes, Rene.

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