Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973
   Class Tritrichomonadea Cepicka, Hampl & Kulda, 2010 see Order Tritrichomonadida Cepicka, Hampl & Kulda, 2010
     Order Tritrichomonadida Cepicka, Hampl & Kulda, 2010 - tritrichomonadids
       Family Monocercomonadidae Kirby, 1944
         Genus Monocercomonasᵀ Grassi, 1879
           1 Monocercomonas batrachorum Dobell, 1908
           2 Monocercomonas colubrorumᵀ (Hammerschmidt, 1844)