Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
   Class Trichonymphea Hartmann, 1911
     Order Trichonymphida Hartmann, 1911
       Family Spirotrichosomidae Hollande & Carruette-Valentin, 1971
         1 Genus Spirotrichosomaᵀ Sutherland, 1933
         2 Genus Macrospironympha Cleveland, Hall, Sanders & Collier, 1934
         3 Genus Leptospironympha Cleveland, Hall, Sanders & Collier, 1934
         4 Genus Apospironympha Cleveland & Day, 1958
         5 Genus Colospironympha Cleveland & Day, 1958
         6 Genus Bispironympha Bobyleva, 1969