Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
   Class Trichomonadea Kirby, 1947
     Order Honigbergiellida Cepicka, Hampl & Kulda, 2010 see Suborder Honigbergiellina Čepička et al., 2010
       Family Honigbergiellidae Cepicka, Hampl & Kulda, 2010
         1 Genus Honigbergiellaᵀ Hampl, Čepička & Kulda, 2007
         2 Genus Pseudotrichomonas Bishop, 1939
         3 Genus Ditrichomonas Farmer, 1993
         4 Genus Monotrichomonas Bernard, Simpson & Patterson, 2000