Class Tubulinea Smirnov et al, 2005 (=Lobosea Cavalier-Smith, 2004)
Diagnosis: amoebae with tubular, subcylindrical pseudopodia or capable of altering the locomotive form from a flattened, expanded one to a subcylindrical one; with monoaxial flow of the cytoplasm in every pseudopodium or in the entire cell.
- Euamoebida (Lepsi, 1960)
Naked amoebae with subcylindrical pseudopodia in locomotion (or the entire cell is monopodial and subcylindrical); without alteration of the locomotive form to a flattened expanded and branched one; without adhesive uroid; glycocalyx amorphous, filamentous or consisting of prismatic, cup-shaped structures.
- Leptomyxida (Pussard et Pons, 1976) Page, 1987
Naked with locomotive form altering from a flattened expanded or reticulate one, when slowly moving, to a subcylindrical monopodial one when in rapid movement or under specific conditions; adhesive uroid; uninucleate with tendency to have more and with Leptomyxa always multinucleate; glycocalyx amorphous; Rhizamoeba saxonica has collosomes under cell membrane.
- Arcellinida Kent, 1880
Testate, inside an organic or mineral extracellular test of either self-secreted elements (calcareous, siliceous, or chitinoid) or recycled mineral particles bound together, with a single main opening.
- Nolandida Cavalier-Smith, 2011
Clavate, monopodial amoebae with pronounced hyaline cap; glycocalyx basally of discrete units, forming truncated pyramids.
- Echinamoebida Cavalier-Smith, 2004
Flattened limax locomotion with or without spine-like subpseudopodia; if spiny subpseudopodia absent, then length/breadth ratio > 6; glycocalyx amorphous.