Closterium.

[microplan]

Hello.
I found this creature in a drop of fresh water.
It was late fall last year.
From studying the literature, it appears that it is some representative of Closterium.
I really like this half-moon shape.
As you can see, the sample was quite thick because I couldn't get both ends of this alga sharp at the same time.

Regards
Maciej

[macnmotion]

Nice video, and a very good look at the gypsum crystals at the ends.

[Francisco]

Nice