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
             Genus Orthosoma Canning, Wigley & Barker, 1983, nom. illeg. see Genus Orthosomella Canning, Wigley & Barker, 1991