Amoeba nuclearia

[carlos.uruguay]

Fresh water
Objective 40X
Oblique polarized light
Panasonic GH4 camera
Free network sound effects
Video link:
https://www.youtube.com/watch?v=rlkzd9EZteM
Video frame preview:


Regards
carlos

[Jacek]

Very nice

[carlos.uruguay]

Thanks Jacek!

[Ecki]

Hi Carlos,

Why do you think it may be N. delicatula?

Best regards
Ecki

[Marek Mis]

Very interesting finding !

Marek

[carlos.uruguay]

Hi Carlos,
Why do you think it may be N. delicatula?
Best regards
Ecki

Hi Ecki!
I did not see the nuclei but following the description of Ferry believed it probable (and for the photos):
https://www.arcella.nl/nuclearia
- Organisms readily adopting a spherical form when uncompressed (yes)
- Without any evident mucus sheath (yes)
But I did not see the nuclei, you're right!
So it can be N. simplex or N. rubra...
That was my mistake, right?

[carlos.uruguay]

Very interesting finding !
Marek

Thanks Marek

[fpelectronica]

Nice and interesting

[carlos.uruguay]

Thanks Francisco!

[Ecki]

Hi Carlos,

In the first image you can see, indirectly, the mucus sheath. The little dots are bacteria that live in the outer perimeter of the mucus sheath.

Every visual identification of Nuclearia to the species level is dubious.

Best regards
Ecki

[carlos.uruguay]

Hi Carlos,

In the first image you can see, indirectly, the mucus sheath. The little dots are bacteria that live in the outer perimeter of the mucus sheath.

Every visual identification of Nuclearia to the species level is dubious.

Best regards
Ecki

Thanks Ecki.
I already edited the video title.
I put only amoeba Nuclearia
A doubt:
This Nuclearia delicatula image shows adhered bacteria:
https://www.arcella.nl/sites/default/fi ... M2-031.jpg
Similar to the video.
What do they adhere to?

[Ecki]

You don't see the mucus layer. Just indirectly because of the bacteria.

N. delicatula is officially known to be the only Nuclearia with multiple nuclei. But that assumption is wrong. I had a Nuclearia in culture that was definitely not N. delicatula which had sometimes up to three nuclei. As Nuclearia is the ancestor to all fungi it is much older. There is a much larger number of Nuclearia species in the world than the couple of species that are formally described.

Molecular analysis - DNA sequencing - has changed our perception in many ways. Amoebae that were thought to be different species are in fact the same species in different phases of their cell cycle. Electron microscopy shows us that micro scales, invisible with the light microscope, differ and seemingly identical amoebae are in fact distinct species.

This should not concern the hobbyist. But it should alert him to only name a protist with a species name if there are distinct and well proven morphological traits which provide a clear method of identification. The number of images and movies in the internet with wrong or dubious species names is huge. This adds to the confusion and makes species descriptions fuzzy.

This is why I am an advocate to name it Xyz sp. - trying to prevent dubious namings that add to the confusion. This forum is becoming a treasure cave of protist images and movies. Let us all try to maximize its value by being as accurate as possible with the namings.

Best regards
Ecki

[carlos.uruguay]

I understand Ecki and I agree. I will not rush any more

[WalterD]

Very interesting clip, I especially like 1.24-1.38.
Thanks for sharing!

[carlos.uruguay]

Thanks Walter