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 Pansporoblastina Tuzet, Maurand, Fize, Michel & Fenwick, 1971
           Family Tuzetiidae Sprague, Tuzet & Maurand, 1977
             Genus Alfvenia Larsson, 1983