organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain eukaryotes see Domain Eukaryota Chatton, 1925
     flagellated protists
       Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
         Class Hypermastigia see Superclass Parabasalia Honigberg, 1973
           Order Spirotrichonymphida Grassé, 1952
             1 Family Spirotrichonymphidae Grassi, 1917 see Family Holomastigotoididae Copeland, 1956
             2 Family Holomastigotoididae Copeland, 1956
             3 Family Holomastigotidae Janicki, 1915 see Family Holomastigotoididae Copeland, 1956