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
           1 Family Unikaryonidae Sprague, 1977
           2 Family Spraguidae Weissenberg, 1976
           3 Family Pereziidae Loubès, Maurand, Comps & Campillo, 1977
           4 Family Cougourdellidae Poisson, 1953
           5 Family Caudosporidae Weiser, 1958
           6 Family Nosematidae Labbé, 1899
           7 Family Mrazekiidae Léger & Hesse, 1922