Hi folks,
The purpose of this posting is to illustrate the structural modification that is continually taking place inside this interesting testate ameoba. I think it might be Arcella vulgaris?
The four photos grouped below are of the same Arcella shot over a 3 minute period. In fact I took about a dozen pics (1 every 15ish seconds) and every one was completely different. The photos were focussed "through" the test - which from other pics that I took appeared to be a ribbed dome (you can see some of the ribbing near the outer edge of the animal). I was unable to identify the double nuclei with any certainty. I did wonder about the round organelle(ish) looking features at about 11 and 4 o'clock?
The two small, single celled critters seem to be inside the test (if that's possible?) or underneath the animal, as they disappeared when I pulled the focus up onto the top of the test. You would have expected them to move into sharper focus if they were above the test.
Bruce
Testate amoeba - Arcella species
Moderators: rjlittlefield, ChrisR, Chris S., Pau
- Bruce Williams
- Posts: 1120
- Joined: Mon Oct 30, 2006 1:41 pm
- Location: Northamptonshire, England
- Contact:
-
- Posts: 1040
- Joined: Thu Aug 03, 2006 10:54 am
- Location: Horsham, W. Sussex, UK
- Contact:
Arcella is always fascinating and your pictures give an excellent insight. For 3D layout have a look at Charlie's posting at http://www.photomacrography.net/forum/v ... ht=arcella
I often find Arcella in samples, but of course not when I set out to look for them. I recently spent some time searching pond samples for one to determine whether the test is transparent at near IR - I still don't know, but if it is it could offer some opportunities for some informative photos.
I often find Arcella in samples, but of course not when I set out to look for them. I recently spent some time searching pond samples for one to determine whether the test is transparent at near IR - I still don't know, but if it is it could offer some opportunities for some informative photos.
Graham
Though we lean upon the same balustrade, the colours of the mountain are different.
Though we lean upon the same balustrade, the colours of the mountain are different.
- Bruce Williams
- Posts: 1120
- Joined: Mon Oct 30, 2006 1:41 pm
- Location: Northamptonshire, England
- Contact:
Thanks Graham,
Yeah that diagonal, 3/4 view of Charlie's is amazing isn't it.
When I first saw Arcella through the scanning 4X objective I thought it was a pollen grain or something similar - then I noticed it was moving! That sent me scuttling of to the net to try and identify it - not easy as I didn't know it was an amoeba - but that's all part of the fun - and it just leads on and on.....
Bruce
Yeah that diagonal, 3/4 view of Charlie's is amazing isn't it.
When I first saw Arcella through the scanning 4X objective I thought it was a pollen grain or something similar - then I noticed it was moving! That sent me scuttling of to the net to try and identify it - not easy as I didn't know it was an amoeba - but that's all part of the fun - and it just leads on and on.....
Bruce
- bernhardinho
- Posts: 563
- Joined: Sun Aug 13, 2006 6:28 am
- Location: Germany
- Contact:
- Bruce Williams
- Posts: 1120
- Joined: Mon Oct 30, 2006 1:41 pm
- Location: Northamptonshire, England
- Contact: