Phylum Amoebozoa Lühe, 1913
   Subphylum Lobosa Carpenter, 1861 see Infraphylum Lobosa Carpenter, 1861
     Class Discosea Cavalier-Smith, 2004
       Subclass Longamoebia Cavalier-Smith & Smirnov, 2011
         Order Thecamoebida Smirnov & Cavalier-Smith, 2011 [monotypic]
           Family Thecamoebidae Schaeffer, 1926
             1 Genus Thecamoebaᵀ Fromentel, 1874
             2 Genus Sappinia Dangeard, 1896
             3 Genus Stenamoeba Smirnov, Nassonova, Chao & Cavalier-Smith, 2007