belonging to the genus Surirella (perhaps Surirella robusta)
We've found it swimming in a freshwater glen
tributary of stream Canelón Chico
near the Marget station in Canelones, Uruguay, South America.
Although Uruguay is a country whose rivers and streams are completely contaminated
by pesticides and transgenic soybean plantations
the beauty of the micro world is born into those murky and poisonous waters.
Oblique polarized light, 20X and 40X objectives
Link:
https://www.youtube.com/watch?v=puBqrSRJYD4
Regards.
carlos
