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Here are some further images from the Hackuarium's old Olympus scope of Moss Menagerie creatures

They were observed at a 200x magnification and the images just taken simply through the ocular with my phone, then cropped...):

Why not start with the latest!? an example of predation (my first blatant example seen, 2021!)! It seems these amoebae can take on 1000 cell organisms too (like this nematode larva):
this spiny testate amoeba showed great purpose in its approach to the worm!

a Nebela , on the move...

another Nebela, or maybe a Corythion (?)

These Swiss Nebela have also been observed having a sort of 'startle' response, from which they recover...
Basically, they explosively contract into their little shell!
(However, tapping the plate or changing light won't induce this response, so what its trigger is remains uncertain.)

a startled one, fully retracted in its shell

a recovering Nebela

Here is a link to a movie of timelapse of the internal motion in one!! (The speed of this video should be at about 15-fold real time, but it is taken from a screen streaming the images from a very low quality usb microscope hooked into the trinocular of the usual old scope in the Hackuarium.)

This sort of rotifer can be very abundant, and is likely a Bdelloid type... They are fun to see move (very stretchy, with posterior attachment site)!

The ciliates can go very fast, so it is hard to show their cilia, which are just visible in this image, and probably cover most of the surface of this protist...

This is probably an empty Corythion test (?) - with spikes!

hope to link to a video of a water bear here!
(thanks for getting the new cultures, Vanessa! after your old one was poisoned by some Anabaena toxin...)

Here is a video of some serious predation by a ciliate (trying to suck up a testate amoeba!)