Kingdom Protoctista Hogg, 1860
   Phylum Microspora Sprague, 1977 - microsporans see Phylum Microsporida Balbiani, 1882
     Class Microsporea Levine & Corliss, 1963 see Class Microsporidea Corliss & Levine, 1963
       Order Microsporida Balbiani, 1882
         Suborder Apansporoblastina Tuzet et al., 1971
           Family Unikaryonidae Sprague, 1977
             1 Genus Unikaryon Canning, Lai & Lie, 1974
             1.1 Genus Oligosporidium Codreanu-Bălcescu, Codreanu & Traciuc, 1981
             2 Genus Encephalitozoon Levaditi, Nicolau & Schoen, 1923
             3 Genus Nosemoides Vinckier, 1975
             3.1 Genus Pleistosporidium Codreanu-Bălcescu & Codreanu, 1982
             4 Genus Tetramicra Matthews & Matthews, 1980
             5 Genus Orthosoma Canning, Wigley & Barker, 1983, nom. illeg. see Genus Orthosomella Canning, Wigley & Barker, 1991
             6 Genus Enterocytozoon Desportes, Le Charpentier, Galian, Bernard, Cochand-Priollet, Lavergne, Ravisse & Modigliani, 1985
             7 Genus Microgemma Ralphs & Matthews, 1986