Phylum Cercozoa Cavalier-Smith, 1998
   Subphylum Filosa T. Cavalier-Smith & E.E.-Y. Chao, 2003
     Superclass Monadofilosa Cavalier-Smith, 1997 see Subphylum Monadofilosa Cavalier-Smith, 1997
       Class Thecofilosea T. Cavalier-Smith & E.E.-Y. Chao, 2003
         Order Tectofilosida Cavalier-Smith, 2003
           1 Genus Pseudodifflugia Schlumberger, 1845