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In the following photos can be seen a thread-like (almost like longkou vermicelli) things. At first I was convinced that it was cyanobacteria, however a classmate said it look more like a little worm, and other person said it look like it was probably nothing (nor prokaryote nor worm). I can't find a way to settle what it is, how can I know?

enter image description here

Zoom 40x

This is from another sample enter image description here

EDIT: Could the first one be lyngbya? I found this website and the second to last picture kind of looks like what it is in my picture:enter image description here

And also could my second picture depict nostoc bacteria?

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    $\begingroup$ The first picture shows something different than the two following picture, doesn't it? Did it move? What is the zoom? You might want to review a little bit your knowledge about the diversity of eukaryotes (incl. unicellular eukaryotes). $\endgroup$
    – Remi.b
    Commented May 22, 2017 at 4:57
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    $\begingroup$ If it doesnt have a mouth and anus and organs it's not a worm. $\endgroup$
    – bandybabboon
    Commented May 22, 2017 at 8:34
  • $\begingroup$ @Remi.b I added that the zoom is 40x. It didn't move, at least not enough for being noticeable. I agree that I need to study about the diversity of single celled organisms, but why do you say eukaryotes? is that a hint? I thought it had to be a procaryote since it sort of look like a very long bacillus. Also, I was convinced it was cyanobacteria, but now I doubt it $\endgroup$
    – Ana Galois
    Commented May 22, 2017 at 17:54
  • $\begingroup$ What was the source of these creatures? $\endgroup$
    – Tyto alba
    Commented May 22, 2017 at 17:56
  • $\begingroup$ @Tytoalba Pond water... very dirty pond water $\endgroup$
    – Ana Galois
    Commented May 22, 2017 at 17:57

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This would be a suggestion rather than a precise answer.

Your sample being pond water a highly probable candidate of the first two photographs would be Euglena sp., though the red eyespot is not visible.

They are freshwater Excavates and according to Washington State Lake Protection Association a common pollution-tolerant genus in Washington water bodies.

enter image description here

Another picture reference: A website

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    $\begingroup$ I think Euglena is a good guess for one of the things in the picture, but I don't think that's what OP meant by "like longkou vermicelli" $\endgroup$
    – Bryan Krause ♦
    Commented May 22, 2017 at 23:51
  • $\begingroup$ :P I missed that. $\endgroup$
    – Tyto alba
    Commented May 23, 2017 at 5:26
  • $\begingroup$ Thank you. I also added another picture I found on the web, perhaps those two are related? $\endgroup$
    – Ana Galois
    Commented May 24, 2017 at 20:08

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