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
       1 Family Honigbergiellidae Cepicka, Hampl & Kulda, 2010
       2 Family Hexamastigidae Cepicka, Hampl & Kulda, 2010
       3 Family Tricercomitidae Cepicka, Hampl & Kulda, 2010