It measures a 85um (0.085mm) long.
Normally it lives in a "house"
and normally it has a large vacuole at its rear end.
So we're not sure which gender it is.
We found it in the freshwater of "Arroyo Grande", Department of Flores, Ruta 3, Km 243, place "Andresito", Uruguay, South America.
I am grateful to Bruce Taylor and William Bourland
your help to try to identify this ciliated
Video link:
https://www.youtube.com/watch?v=YG8R2i_udN8
Video frame preview:

Regards
carlos