Circular diatom

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glennbech
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Circular diatom

#1 Post by glennbech » Sat May 07, 2016 7:39 am

Hi,

In my pond water sample I have so far only found rectangular diatoms, no "live" round ones, until I saw this yesterday. Does anyone have any pointers on diatom anatomy? They are unicellular, and it could be interesting to know more about it's internal parts.

40x Objective. 10x eyepiece, afocal Nexus 6P.

Last edited by glennbech on Sat May 07, 2016 12:46 pm, edited 1 time in total.

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75RR
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Re: Circular diatom

#2 Post by 75RR » Sat May 07, 2016 9:37 am

Worth looking through the Resources section, lots of stuff there:

viewtopic.php?f=15&t=171

Video is sign in ?
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

glennbech
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Re: Circular diatom

#3 Post by glennbech » Sat May 07, 2016 11:46 am

75RR wrote:Worth looking through the Resources section, lots of stuff there:

viewtopic.php?f=15&t=171

Video is sign in ?
Video fixed. Was set to private by accident. Thanks for the heads up in the resource section.

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wmodavis
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Re: Circular diatom

#4 Post by wmodavis » Sat May 07, 2016 12:30 pm

I only get a Sign In notice
https://youtu.be/yiBoiYKSWC0
Bill Davis
Olympus BH-2/BHS and BH-2/BHT both with trinoc head.

glennbech
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Re: Circular diatom

#5 Post by glennbech » Sat May 07, 2016 7:20 pm

Video fixed.

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75RR
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Re: Circular diatom

#6 Post by 75RR » Sat May 07, 2016 7:25 pm

That looks like a Testate Amoeba

http://www.arcella.nl/overview-all
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

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gekko
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Re: Circular diatom

#7 Post by gekko » Sat May 07, 2016 9:36 pm

Nice, 75RR may be right: hard for me to guess at such magnification. If I may ask a question (not meant as criticism, but out of curiosity): why not a still image, since there is no movement? Thanks.

JimT
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Re: Circular diatom

#8 Post by JimT » Sun May 08, 2016 2:40 am

I think 75RR is correct that it is a testate amoeba. Still a good video and I thought I saw some movement as you zoomed in :?:

glennbech
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Re: Circular diatom

#9 Post by glennbech » Sun May 08, 2016 4:28 am

gekko wrote:Nice, 75RR may be right: hard for me to guess at such magnification. If I may ask a question (not meant as criticism, but out of curiosity): why not a still image, since there is no movement? Thanks.
Criticism is great. Look at the topic. It's probably an amoeba, not a diatom. I totally new at this, and absorb all comments for learning :)
If you look carefully, It's moving around, slowly. Since it could not get it to stand still, I decided to go for a movie since I could get no stack.

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gekko
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Re: Circular diatom

#10 Post by gekko » Sun May 08, 2016 2:00 pm

glennbech wrote:
gekko wrote:Nice, 75RR may be right: hard for me to guess at such magnification. If I may ask a question (not meant as criticism, but out of curiosity): why not a still image, since there is no movement? Thanks.
Criticism is great. Look at the topic. It's probably an amoeba, not a diatom. I totally new at this, and absorb all comments for learning :)
If you look carefully, It's moving around, slowly. Since it could not get it to stand still, I decided to go for a movie since I could get no stack.
Thank you, glennbech: valid reasons for a video.

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Re: Circular diatom

#11 Post by glennbech » Sun May 08, 2016 7:13 pm

Hi. I removed the zoom from the video since it interfered with what seems to be some kind of internal contraction "12 o clock" of some sorts at around 9 seconds. Does anyone know what it is?


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gekko
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Re: Circular diatom

#12 Post by gekko » Sun May 08, 2016 8:00 pm

In order to see it better, I took the liberty to copy a single frame from your video and enlarge the image and increase the contrast, and my not-at-all-expert guess is still that this is probably amoeba, as 75RR and JimT have already said.

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