organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Protoctista Hogg, 1860
     Phylum Zoomastigina see Phylum Discomitochondria
       Class "parabasalids" see Class Parabasalia Honigberg, 1973
         Order Trichomonadida Kirby, 1947 - trichomonads
           Family Monocercomonadidae Kirby, 1944
             1 Genus Hexamastix Alexeieff, 1912
             2 Genus Monocercomonas Grassi, 1879
             3 Genus Histomonas Tyzzer, 1920