Thank you very much for taking your time to watch and analyze my videos, Bruce.
Your considerations are very interesting to me. Regarding the first video, I have not found more critters like that. At first, I thought it could be a Hypotrich, later I thought of
Lembadion and, finally, I returned to the Hypotrich hypothesis, but I was unable to identify even the genus. It is very plausible that it could be a teratological specimen. In fact, it is common to see deformed or monstrous Hypotrichs. It is a pity, because it was a very nice bug to be a new species!
As for the second, I have not found other similar organisms either, but I did observe at the time an important population of
Stentor roeseli that, little by little, gave way to a population of
Stentor coeruleus.
It is always worth asking. Thank you!