Genus Amoeba Bory de St. Vincent, 1822
Diagnosis: locomotive cells commonly polypodial, with several tubular pseudopodia with hemispherical tips and usually hyaline caps; one pseudopodium dominant at one time, often with ectoplasmic ridges; monopodial in rapid locomotion; nucleus single, granular in most described species; resting cells irregularly rounded, floating form with long radiating pseudopodia; cytoplasm often with truncated bipyramidal crystals; posterior uroid morulate.
Ecology: Freshwater. In all kind of water types.
Key to the species: