Not sure if the ID is correct.
These are growing abundantly on the fine fibers of an alga in MSU's botanical garden. Visible to the naked eye as a white cloud.
Video here: https://vimeo.com/185699227
400x, Toluidine Blue Dye
400x, Toluidine Blue dye
area in stream surveyed had a flowing mat that had a blue tinge to it
Ciliado de agua de charca de la Facultad
The ciliates are a group of protozoans characterized by the presence of hair-like organelles called cilia, which are identical in structure to eukaryotic flagella, but typically shorter and present in much larger numbers with a different undulating pattern than flagella. Cilia occur in all members of the group (although the peculiar Suctoria only have them for part of the life-cycle) and are variously used in swimming, crawling, attachment, feeding, and sensation.