Order Amoebida Kent, 1880
Family Schizoyrenidae Singh, 1952 emend. Singh and Das, 1970
Definition; The resting nucleus contains a more or less central Feulgen-negative nucleolus or several Feulgen-negative nucleoli, which during mitosis form 'polar masses'. Nuclear membrane persists throughout division. "Interzonal bodies' may be present. Amoebae may have more than one nucleus, and some genera may produce flagellate stage.
Family Hartmannellidae Volkonsky, 1931 emend. Singh, 1952
Definition; The resting nucleus has either a single Feulgen-negative nucleolus or several Feulgen-negative nucleoli. During mitosis the nucleolus, or nucleoli, disappear and a spindle with chromosomes arranged as an equatorial plate resembling that found in higher animals and plants develops. The nuclear membrane disappears during mitosis. Amoebae may be uni-or multinucleate; no temporary flagella have been discovered.