Class Lobosea (Carpenter, 1861) Cavalier-Smith, 1993 see Subphylum Lobosa Carpenter, 1861
   Subclass Gymnamoebia (Haeckel, 1862) Cavalier-Smith, 1993 see [unranked] Gymnamoebae
     Order Euamoebida Lepşi, 1960
       Family Hartmannellidae Volkonsky, 1931
         Genus Hartmannella Alexeieff, 1912
           1 Hartmannella cantabrigiensis Page, 1974
           2 Hartmannella vermiformis Page, 1967 see Vermamoeba vermiformis (Page, 1967)