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.


  1. Order Arcellinida Saville 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.
  2. Order Euamoebida (Lepşi, 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.
    Suborder 1. Amoebina Cavalier-Smith, 2016
    Suborder 2. Nolandina Cavalier-Smith, 2016 
  3. Order Leptomyxida (Pussard and 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.
  4. Order Echinamoebida Cavalier-Smith, 2004
    Flattened limax locomotion with or without spine-like subpseudopodia; if spiny subpseudopodia absent, then length/breadth ratio > 6; glycocalyx amorphous.
  5. Order Corycidia

  6. Order Trichosida Möbius, 1889