Planktonic protists

The word "plankton" shares a Greek root with "planet" (πλαγκτός, meaning drifting or wandering)-- an etymological link which seems particularly appropriate for these drifting microbes, spherical or stellate in form: 

Protists - Cells in the Sea from Parafilms on Vimeo.

This beautiful clip is one of a series called Plankton Chronicles, found via The Book of Barely Imagined Beings.