This is a blue-green spheroidal alga. In the movie it is surrounded by smaller coccoid green algae. Cylindrospermum Blue-green filamentous alga, forming necklaces of oblong cells. Blue-green clear colour. The organisms described from here on are eukaryotic.
Euglenids have one or more often two flagella.
Often they also have a photosensitive red spot called a stigma. A lot of flagellate algae live individually, though some live in colonies. Anisonema This has two flagella, one of which is directed forward, and the other is longer and is dragged by the protist. Peranema This has only a single flagellum directed forward, which is mobile at its end. Phacus Flat heart-shaped flagellate.