Kingdom Protozoa Goldfuss, 1818 - protozoa
Subkingdom Corticata Lankester, 1878
see Subkingdom Biciliata
Infrakingdom Excavata T. Cavalier-Smith, 2002
see Supergroup Excavata Cavalier-Smith, 2002
Superphylum Eozoa Cavalier-Smith, 1997
see Infrakingdom Eozoa Cavalier-Smith, 1997
Phylum Metamonada Grassé, 1952
Subphylum Trichozoa Cavalier-Smith, 1997
Superclass Parabasalia Honigberg, 1973 - parabasalids
see Infraphylum Parabasalia Honigberg, 1973
Class Trichomonadea Kirby, 1947
Order Lophomonadida Light, 1927
Genus Microjoenia Grassi, 1892