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Flabellinia Smirnov et al. 2005

Diagnosis: Flattened generally fan-shaped, oblong or irregularly triangular cells, never with pointed subpseudopodia.

Thecamoebida Schaeffer 1926, sensu Smirnov et al. 2011
Flattened amoebae, oblong, lingulate or irregularly triangular amoebae, usually with dorsal folds and/or ridges; anterior hyaloplasm often forms an anterolateral crescent and rarely occupies more than half of the body length; never produce discrete pseudopodia or subpseudopodia.
Sappinia, Stenamoeba, Stratorugosa, Thecamoeba.

Dermamoebida Cavalier-Smith 2004
Oblong, lancet-shaped or irregularly triangular cells; with a smooth cell surface or with few wide ridges, never wrinkled; short, wide triangular pseudopodia and, in some, subpseudopodia of dactylopodial type; thick cell coat, multilayered or consisting of tightly packed helical structures.
Dermamoeba, Mayorella, Paradermamoeba.

Dactylopodida Smirnov et al. 2005, sensu Kang et al. 2017
Locomotive form mostly has a shape of an irregular triangle with basement directed forward; wide anterior hyaloplasm; fibrous axial cores both in dactylopodia and in the floating pseudopodia.
Cunea, Janickina*, Korotnevella, Neoparamoeba, Paramoeba, Pseudoparamoeba, Vexillifera.
Incertae sedis: Boveella, Dactylosphaerium, Oscillodignum, Podostoma, Strioluatus, Subulamoeba,Trienamoeba.

Vannellida Smirnov et al. 2005
Locomotive form fan-shaped to spatulate; cells do not form discrete pseudopodia or subpseudopodia; wide anterior hyaloplasm up to a half of the cell; posterior granuloplasm concentrated in a ‘hump’, often raised over the substratum; one species of Vannella (V. fimicola) with protosteloid sporocarps.
Clydonella, Lingulamoeba, Paravannella, Pessonella*, Ripella, Vannella.
Incertae sedis Vanellida: Discamoeba, Unda.

Stygamoebida Smirnov et al. 2011
Flattened, elongate amoebae resembling tooth-picks or splinters, temporarily acquiring forked or branched form; elongate, expanded area of anterior hyaloplasm; mitochondrial cristae flattened, ribbon-like; MTOC known in one species.
Stygamoeba, Vermistella.

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