Evidently not monophyletic but placed together here for convenience. Includes genus Acanthamoeba . Includes genus Hartmannella. Include the genera Amoeba and Vannella. Unicellular with two flagellae.
Some species are algal-like with green pigments for photosynthesis.
These organisms found in a wide variety of moist places ranging from algal blooms in the sea and on beaches to intestinal parasites in animals. Sometimes placed in the Cryptophyta. Planktonic organisms, usually unicellular, found mainly in the sea but also in freshwater. Have no mitochondria but instead have symbiotic bacteria that seem to perform a similar function thus illustrating how mitochondria might have started out prior to their total integration into the cellular machinery. Known only from a few species in the genus Pelomyxa that occur in the Northern Hemisphere in low oxygen freshwater muds.