Diatoms from the Seychelles!
Diatoms from the Seychelles!
Hi together,
yesterday I had a look at a couple of diatom slides and found an interesting one from the Seychelles. I didn't wan't to touch the oil resources so used the Zeiss Jena 40 / 0,95 dry Apo. Here I will show some better snapshots.
The slide contains objects that I would ithink of as pollen so organic material might be present.
The first one might be a Cocconeis alucitae corrected:Climacosphenia elongata. I will post some more.
Bob
yesterday I had a look at a couple of diatom slides and found an interesting one from the Seychelles. I didn't wan't to touch the oil resources so used the Zeiss Jena 40 / 0,95 dry Apo. Here I will show some better snapshots.
The slide contains objects that I would ithink of as pollen so organic material might be present.
The first one might be a Cocconeis alucitae corrected:Climacosphenia elongata. I will post some more.
Bob
- Attachments
-
- Cocconeis alucitae pysharp_sup0_Hi20_al1 Ausschnitt 1024.jpg (113.88 KiB) Viewed 4293 times
Last edited by MicroBob on Fri Dec 13, 2019 7:46 am, edited 1 time in total.
Re: Diatoms from the Seychelles!
Very nice catch, Bob!
Impressive use of the dry 40X0.95.
Please details about illumination, mounting media (or is it air?), darkfield condenser.
I myself found some diatoms quite like your long one with rectangular "windows" in the shore mud of the Mediterranean Sea recently, but did not make permanent slides yet.
Impressive use of the dry 40X0.95.
Please details about illumination, mounting media (or is it air?), darkfield condenser.
I myself found some diatoms quite like your long one with rectangular "windows" in the shore mud of the Mediterranean Sea recently, but did not make permanent slides yet.
Re: Diatoms from the Seychelles!
Very nice image, like how it shows off the variety and detail. Great ad for diatoms.
Long diatom running left to right looks like the valve view of a Licmophora
viewtopic.php?t=7839
-
Long diatom running left to right looks like the valve view of a Licmophora
viewtopic.php?t=7839
-
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)
Re: Diatoms from the Seychelles!
Hi Doron,
this was mounted in Naprax, no idea how the material was cleaned, for sure no harsh acid cleaning. Image taken with Zeiss DIC "old". When everything fits perfectly one gets a kind of darkfield look. With the Zeiss Jena 40/0,95 I only get a black strip which I can place as best as possible, so I always have a gradient in the image. All images are stacked from 20-40 single shots with Picolay.
The old Phomi with it's Optovar has a tube factor of 1,25x, 1,6x or 2x. So the image is always at least 12,5x post magnified with 10x eyepieces. This makes high aperture objectives useful. Without the Optovar I didn't see as much use in this objective. With the Phomi it is useful for quick scanning of slides with fine detail. Among the slides I looked at were several quite boring ones and it would have been a lot of work to clean them from oil after a short look.
@ Glen,
I got the identification from this document: https://micronesica.org/sites/default/f ... final2.pdf and the image of Cocconeis alucitae corrected:Climacosphenia elongata fits quite well. The outer shapes of Licmophora drawing look similar, but they don't seem to have these internal compartments. Your linked image in contrary shows a diatom that is very similar to the one I posted here. Maybe your fresh diatom was a Cocconeis corrected:Climacosphenia elongata too? This would for sure be a nice object for a SEM!
Here comes the next diatom, probably girdle band view and of a very interesting shape. Do you have an ID for this one, Glen?
Bob
this was mounted in Naprax, no idea how the material was cleaned, for sure no harsh acid cleaning. Image taken with Zeiss DIC "old". When everything fits perfectly one gets a kind of darkfield look. With the Zeiss Jena 40/0,95 I only get a black strip which I can place as best as possible, so I always have a gradient in the image. All images are stacked from 20-40 single shots with Picolay.
The old Phomi with it's Optovar has a tube factor of 1,25x, 1,6x or 2x. So the image is always at least 12,5x post magnified with 10x eyepieces. This makes high aperture objectives useful. Without the Optovar I didn't see as much use in this objective. With the Phomi it is useful for quick scanning of slides with fine detail. Among the slides I looked at were several quite boring ones and it would have been a lot of work to clean them from oil after a short look.
@ Glen,
I got the identification from this document: https://micronesica.org/sites/default/f ... final2.pdf and the image of Cocconeis alucitae corrected:Climacosphenia elongata fits quite well. The outer shapes of Licmophora drawing look similar, but they don't seem to have these internal compartments. Your linked image in contrary shows a diatom that is very similar to the one I posted here. Maybe your fresh diatom was a Cocconeis corrected:Climacosphenia elongata too? This would for sure be a nice object for a SEM!
Here comes the next diatom, probably girdle band view and of a very interesting shape. Do you have an ID for this one, Glen?
Bob
- Attachments
-
- Diatomee Seychellen 1024.jpg (120.44 KiB) Viewed 4251 times
Last edited by MicroBob on Fri Dec 13, 2019 7:48 am, edited 1 time in total.
Re: Diatoms from the Seychelles!
Thanks for the link - useful to have.
I have to agree that it is not Licmophora (I am still in shock) but neither is it Cocconeis
Note that the plate numbers are above the image, not below. That would make it plate 6
See link below for confirmation
So looks like it is: Climacosphenia elongata
https://pubs.usgs.gov/of/2012/1163/page ... Azores.pdf
Update: Have now been able to confirm that the diatom in my first link viewtopic.php?t=7839 is Climacosphenia moniligera :)
I have to agree that it is not Licmophora (I am still in shock) but neither is it Cocconeis
Note that the plate numbers are above the image, not below. That would make it plate 6
See link below for confirmation
So looks like it is: Climacosphenia elongata
https://pubs.usgs.gov/of/2012/1163/page ... Azores.pdf
Update: Have now been able to confirm that the diatom in my first link viewtopic.php?t=7839 is Climacosphenia moniligera :)
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)
Re: Diatoms from the Seychelles!
Thank you for pointing this error out! I have corrected it in the text. The formatting of my ID resource is not too clear and I connected the wrong description to the right image. But at least this new ID should be close to spot on.
Re: Diatoms from the Seychelles!
I think it might be a Biddulphia
possibly Biddulphia capusina or Biddulphia tridens: https://www.oamarudiatoms.co.uk/gallery_302510.html
-
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)
Re: Diatoms from the Seychelles!
Hi Glen,
thank for the ID and the link!
Here one more in diagonal orientation, Anne from the german forum names it Biddulphia pulchella.
Diatoms are a bit like architecture - once you have grasped the general concept it becomes understandable. I have not yet reached this state with diatoms...
I recently came to proper ID literature at least for european diatoms!
Bob
thank for the ID and the link!
Here one more in diagonal orientation, Anne from the german forum names it Biddulphia pulchella.
Diatoms are a bit like architecture - once you have grasped the general concept it becomes understandable. I have not yet reached this state with diatoms...
I recently came to proper ID literature at least for european diatoms!
Bob
- Attachments
-
- B pysharp_sup5_al1 Ausschnitt 1024.jpg (185 KiB) Viewed 4198 times
Re: Diatoms from the Seychelles!
It would be nice to have 3D representations of some of them.Diatoms are a bit like architecture - once you have grasped the general concept it becomes understandable.
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)
Re: Diatoms from the Seychelles!
Interesting thread, great images, really like the oblique view!
Yes, getting a look at a variety of angles is hugely helpful to understanding the architecture of these fascinating forms! Here's an article I found pretty interesting on the very subject:
https://tinyurl.com/u5bchhq
Yes, getting a look at a variety of angles is hugely helpful to understanding the architecture of these fascinating forms! Here's an article I found pretty interesting on the very subject:
https://tinyurl.com/u5bchhq
Cheers,
Kurt Maurer
League City, Texas
email: ngc704(at)gmail(dot)com
https://www.flickr.com/photos/67904872@ ... 912223623/
Kurt Maurer
League City, Texas
email: ngc704(at)gmail(dot)com
https://www.flickr.com/photos/67904872@ ... 912223623/
Re: Diatoms from the Seychelles!
Many thanks for the link. Impressive work.KurtM wrote: ↑Sat Dec 14, 2019 12:51 amHere's an article I found pretty interesting on the very subject:
https://tinyurl.com/u5bchhq
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)
Olympus E-P2 (Micro Four Thirds Camera)
Re: Diatoms from the Seychelles!
Hi Kurt,KurtM wrote: ↑Sat Dec 14, 2019 12:51 amYes, getting a look at a variety of angles is hugely helpful to understanding the architecture of these fascinating forms! Here's an article I found pretty interesting on the very subject:
https://tinyurl.com/u5bchhq
thank you for this link! The comparative views are really interesting. And all these shapes will have a function for the algae!
Here another image, probably again a Biddulphia in frustule view.
Bob
- Attachments
-
- a2 pysharp_sup0_fil7_al1-RGB1024.jpg (72.29 KiB) Viewed 4141 times
Re: Diatoms from the Seychelles!
Thanks for the link, Kurt
... a very informative article.
MichaelG.
... a very informative article.
MichaelG.
Too many 'projects'
Re: Diatoms from the Seychelles!
Must agree, not my area as they say, but really interesting images and the link is to a very readable (for such as myself with no Diatom knowledge at-all) and interesting article!
As mentioned, the variety of forms must surely be a response to optimal requirements in one way or another - clearly a fascinating subject when the surface is scratched!
As mentioned, the variety of forms must surely be a response to optimal requirements in one way or another - clearly a fascinating subject when the surface is scratched!
John B