eukaryotes see Domain Eukaryota Chatton, 1925
   Centroheliozoa Dürrschmidt & Patterson, 1987 see Class Centrohelea Kühn, 1926
     Family Acanthocystidae Claus, 1874
       1 Genus Pseudoraphidocystis Mikrjukov, 1997
       2 Genus Pseudoraphidiophrys Mikrjukov, 1997
       3 Genus Pterocystis Siemensma & Roijackers, 1988
       4 Genus Echinocystis Mikrjukov, 1997
       5 Genus Choanocystis Penard, 1904
       6 Genus Acanthocystis Carter, 1863