organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     amoeboid protists
       Phylum Heliozoa Haeckel, 1866 see Subphylum Heliozoa Haeckel (1866)
         Order Centrohelida 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