Class Discosea Cavalier-Smith, 2004 em. Smirnov et al, 2011
Diagnosis: Flattened naked amoebae, never producing tubular, subcylindrical pseudopodia and never altering the locomotive form. Cytoplasmic flow polyaxial or without a pronounced axis. No flagellate stage in the life cycle; subpseudopodia, if present, short, never both pointed and branched.
Subclass Flabellinia Smirnov et al. 2005, em. Smirnov and Cavalier-Smith 2011
Diagnosis: Flattened amoebae, generally fan-shaped, discoid or irregularly triangular, never with pointed subpseudopodia or centrosomes.
Subclass Longamoebia Cavalier-Smith and Smirnov 2011
Diagnosis: Flattened amoebae, elongated; with pointed subpseudopodia and centrosomes in one order.
The diagrams below show morphotypes of locomotive forms of Discosea: