with the body covered with small pebbles.
Browse the water with its long flagellum
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 David J. Patterson for their invaluable help
Phase contrast, 40X objective
Video link:
https://www.youtube.com/watch?v=uNUY25uv1ZM
Video frame preview:

Regards
carlos