Amoeba? (Marine sample)

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75RR
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Amoeba? (Marine sample)

#1 Post by 75RR » Thu Jun 18, 2020 8:37 am

Came across this the other day while I was looking for a subject to compare the colour fidelity of DIC vs Brightfield viewtopic.php?f=6&t=9619#p82003

Did not notice it at first as I was concentrating on the Diatom.

Never seen one (if it is an amoeba) quite like this, nor can I find anything similar looking.

Would appreciate ID suggestions from anyone with an interest in amoebae

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Re: Amoeba? (Marine sample)

#2 Post by ImperatorRex » Thu Jun 18, 2020 9:22 am

Really strange thing 75RR. Would be important to see if the object moves or change the pseudopodia.

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Re: Amoeba? (Marine sample)

#3 Post by 75RR » Thu Jun 18, 2020 10:08 am

.
Just looked at the original video again. It it 5 minutes long and during that time I could not discern any movement.

However if you look at the two images below one can see that 'it' is no longer in the same position in each image.

Image

Perhaps not an amoeba after all.
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Re: Amoeba? (Marine sample)

#4 Post by Zuul » Thu Jun 18, 2020 2:16 pm

Choanoflagellate Colony? Dead or nearly so.

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Re: Amoeba? (Marine sample)

#5 Post by 75RR » Thu Jun 18, 2020 3:01 pm

Thanks Zuul

Had thought of Choanoflagellate but the shape does not seem quite right, missing the funnel and flagella + this seems to have a body.

Still, something along those lines is probably right.

Perhaps an anemone?
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Re: Amoeba? (Marine sample)

#6 Post by micro » Thu Jun 18, 2020 6:47 pm

You can see it's vacuoles appearing and disappearing which suggests it's an amoeba.

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Re: Amoeba? (Marine sample)

#7 Post by 75RR » Thu Jun 18, 2020 6:54 pm

Thanks micro

Has anyone had contact with Ferry Siemensma from Microworld - https://www.arcella.nl/contact/ Would he mind if I asked him?
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Re: Amoeba? (Marine sample)

#8 Post by mazo4033 » Fri Jun 19, 2020 4:30 am

Wow! It’s beautiful. I think it is an amoeba because of the presence of various vacuoles and organelles, and I think there is a contractile vacuole (only one) which is a quantity that I believe is characteristic to amoebae. It kind of looks like an amoeba in a stage where is is about to/in preparation to divide. If you go to Ferry Siemensma’s website, search “Amoeba proteus” and look at the drawn diagrams, there is an image quite similar to your video. So perhaps it is Amoeba proteus in preparation for division? It is incredible, thank you for sharing!

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Re: Amoeba? (Marine sample)

#9 Post by 75RR » Fri Jun 19, 2020 4:41 am

Thanks mazo4033
mazo4033 wrote:
Fri Jun 19, 2020 4:30 am
If you go to Ferry Siemensma’s website, search “Amoeba proteus” and look at the drawn diagrams, there is an image quite similar to your video. So perhaps it is Amoeba proteus in preparation for division?
Good catch! Don't recall seeing that image - here is a link to it:
.
Amoeba proteus: A-C polypodial locomotion; D monopodial locomotion; E amoeba in preparation for division; F bipyramidal crystal; G plate-shaped crystal; H clustered crystals.
Image
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Re: Amoeba? (Marine sample)

#10 Post by mazo4033 » Sun Apr 25, 2021 1:44 am

Though I still think that this might be an amoeba preparing for division, given that it looks very similar to that, I do have an interesting image. I had been reading the book Handbook of Protozoology by Richard Kudo when I encountered an organism of a shape similar to one I had only seen once before, in this post:

Image

This organism is more shell-like, I believe, imagine like Radiolaria or Forminifera, which is why I don’t think it is the organism that you found, but I thought this was an interesting thing worth posting about :)

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Re: Amoeba? (Marine sample)

#11 Post by 75RR » Sun Apr 25, 2021 8:02 am

Hi mazo4033, it is curious how one finds similar 'shapes' in distinct organisms.

Thanks for the image
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