Archamoebae
The group includes many genera which are internal parasites or commensals of animals: for example Entamoeba and Endolimax. Some are human pathogens, causing diseases such as amoebic dysentery. Other genera of archamoebae live in freshwater habitats, and have flagella.  Most have a single nucleus and flagellum, but the giant amoeba Pelomyxa has many of each.