Phylum Parabasalia Honigberg, 1973 see Infraphylum Parabasalia Honigberg, 1973 Class Trichomonadea Kirby, 1947 Order Trichomonadida Kirby, 1947 - trichomonads Family Trichomonadidae Chalmers & Pekkola, 1918 Genus Tetratrichomonas Parisi, 1910 Tetratrichomonas undula Cepicka, Hampl & Kulda, 2010