Trembling Protists

UPDATE: This footage was obtained June 17, 2024. As of today, July 2, 2024, there is not a single Euglenid alive, dying or dead in the sample container. Not a trace of any Euglenids at all; as if they never existed in this sample.
Trembling. Shivering. Shaking.
Never before seen this type of behavior, mostly exhibited by Euglenids (by the dozens) in this sample. Only one other protist had the "shakes" during this viewing.
At first, I thought the shaking was due to vibration from the air conditioner, or a heavy truck outside. But, further investigation shows only the Euglenids are shaking!
Then I thought maybe there's some toxin in the liquid, affecting their behavior. But why only the Euglenids?
Even more puzzling, is that after a while, many of the protists will straighten up and just swim away, not shaking or trembling at all...like nothing happened.
Another interesting foray into the microbe world, leaving with more questions than answers.
No cover slip was used for this specimen; the liquid was exposed in a concave slide; could not utilize the 40X objective without dipping it into the water.
Video taken with Hayear HY-500 camera, Amscope M620 microscope with 4X, 10X, 20X, objectives. Additional processing used Mac Photo.
Original song/video "Baile y Baile" by My-Fi Saloon @my-fisaloon8370
/ @my-fisaloon8370

[@DonSchaeffer-ew3dz]

I have seen this kind of thing many times. It takes slightly different forms. Sometimes it looks like the protist is just needing to move but has nowhere to go, a kind of restlessness. They will sometimes stop doing this and just continue on their way. In human beings we might call it "expressive movement."

[@SeeWithMeMicroscopy]

Interesting! I’ve never witnessed this previously. Since this was videoed, all the Euglenids in the specimen plate have vanished. Nothing remains of them. I’m thinking these are related incidents.

[@DonSchaeffer-ew3dz]

@@SeeWithMeMicroscopy Who knows?