Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
   Class Spirotrichonymphea Grassé, 1952 see Order Spirotrichonymphida Grassé, 1952
     Order Spirotrichonymphida Grassé, 1952
       Family Holomastigotoididae Copeland, 1956
         01 Genus Holomastigotoidesᵀ Grassi, 1911
         02 Genus Holomastigotes Grassi, 1892
         03 Genus Microjoenia Grassi, 1892
         04 Genus Spirotrichonympha Grassi, 1911
         05 Genus Spironympha Koidzumi, 1917
         06 Genus Spirotrichonymphella Grassi, 1917
         07 Genus Rostronympha Duboscq, Grassé & Rose, 1937
         08 Genus Spiromastigotes Duboscq & Grassé, 1943
         09 Genus Micromastigotes Hollande & Carruette-Valentin, 1971
         10 Genus Uteronympha Brugerolle, 2006