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
             Genus Thecamoebaᵀ Fromentel, 1874
               Thecamoeba sphaeronucleolus (Greeff, 1891) Schaeffer, 1926