Anisonema is a genus of colorless flagellates that occur in marine, brackish, and freshwater habitats.

[1] The cell is typically ovoid, somewhat flattened, and rigid.

[1] The shorter flagellum extends forwards and propels movement with a sweeping motion, while the longer flagellum, up to three times the length of the cell, trails behind, with jerking contractions.

[1][2][3] The genus was first named by French biologist Félix Dujardin his 1841 Histoire naturelle des zoophytes.

Infusoires, comprenant la physiologie et la classification de ces animaux, et la manière de les étudier à l'aide du microscope.