Cercozoa Cavalier-Smith, 1998
   Filosa T. Cavalier-Smith & E.E.-Y. Chao, 2003
     Imbricatea T. Cavalier-Smith & E.E.-Y. Chao, 2003
       1.1 Thaumatomonadida Shirkina, 1987
       1.2 Spongomonadida Hibberd, 1984
       2.1 Genus Ovulinata Anderson, Rogerson & Hannah, 1996
       2.2 Genus Paulinella Lauterborn, 1895