centrohelid heliozoa Kühn, 1926
Count: [f] 6f;4g;1s
   Suborder Pterocystina Cavalier-Smith & von der Heyden, 2007
  Count: [f] 3f;3g
     Family Choanocystidae Cavalier-Smith & von der Heyden, 2007
    Count: [g] 1g
       1 Genus Choanocystis Penard, 1904
      Count: -