The first one is Netzelia oviformis, look here: http://www.arcella.nl/netzelia-oviformis
The second is Acanthocystis turfacea: http://www.arcella.nl/acanthocystis-turfacea

beautiful image!

Intersting row of amoebae. I don't know what it is, your images aren't very clear. Maybe it is a Mayorella species, anyway, it's not Amoeba proteus.

Also the opposite is true: the better your pictures, the more you can learn about your subject

Yes, it is. There are two, usually, one on both sides.

Hi Ralf, It is very difficult to identify these kind of species only based on one single shell. You also have to know how it looks in side view, e.g. is there a keel or ridge or how is the shape of the aperture? And how are other shells in your sample: larger or smaller, broader or more slender? The...

It is Plagiophrys scutiformis. Not rare, but never in large numbers. Look at http://www.arcella.nl/plagiophrys-scutiformis

Why do you think it's an Arcella? It doesn't look like that.

Yes, Artodiscus saltans.

Btw how to use flash for video???

I use the same illumination for my videos... So there is no difference.

You don't need flash. I use the (led-)illumination of my Olympus BX51 together with a Canon 70D and that's enough light for amoebae

That's a Diplophrys species, but the latest one wasn't clear to me.

I don't know what this one is, but one of your latest videos showed a Diplophrys or closely related species.

I'm not convinced it's a Diplophrys. It moves to fast and the refractive globules look different. It's bipolar, but probably a quite different protist.