Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
   Class Hypotrichomonadea Cepicka, Hampl & Kulda, 2010 see Suborder Hypotrichomonadina Čepička et al., 2010
     Order Hypotrichomonadida Cepicka, Hampl & Kulda, 2010 see Suborder Hypotrichomonadina Čepička et al., 2010
       Family Hypotrichomonadidae Honigberg, 1963
         1 Genus Hypotrichomonas Lee, 1960
         2 Genus Trichomitus Swezy, 1915