Kingdom Protoctista Hogg, 1860
   Phylum Zoomastigina see Phylum Discomitochondria
     01 Class Amebomastigota
     02 Class bicoecids
     03 Class choanomastigotes see [unranked] choanoflagellates
     03.0 Class Choanomastigota see [unranked] choanoflagellates
     04 Class Diplomonadida see Order Diplomonadida Wenyon, 1926
     04.0 Class diplomonads
     05 Class Pseudociliata see Order Pseudociliatida Corliss & Lipscomb, 1982
     06 Class Kinetoplastida Honigberg, 1961 see Class Kinetoplastea Honigberg, 1963
     06.0 Class kinetoplastids see [unranked] kinetoplastids
     07 Class Opalinata Wenyon, 1926 see Superclass Opalinata Wenyon, 1926
     07.0 Class opalinids see Family Opalinidae Claus, 1874
     08 Class Proteromonadida see Family Proteromonadidae Grassé, 1952
     08.0 Class proteromonads see Family Proteromonadidae Grassé, 1952
     09 Class Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
     10 Class Retortamonadida see Order Retortamonadida Grassé, 1952
     10.0 Class retortamonads
     11 Class Pyrsonymphida