Parabasalia Honigberg, 1973 - parabasalids
   1 Class Hypotrichomonadea Čepička et al., 2010 see Suborder Hypotrichomonadina Čepička et al., 2010
   2 Class Trichomonadea Kirby, 1947
   3 Class Tritrichomonadea Cepicka et al., 2010 see Order Tritrichomonadida Čepička et al., 2010
   4 Genus Trichocovina Maaß & Radek, 2006
   5 Class Cristamonadea (Brugerolle & Patterson, 2001) I. Cepicka et al., 2010 - cristamonads
   6 Class Trichonymphea Cavalier-Smith, 2003
   7 Class Spirotrichonymphea Grassé, 1952 see Order Spirotrichonymphida Grassé, 1952
   8 Genus Chilomitus de Fonseca, 1915