Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Rozellomycota Doweld (2013)
     Class Microsporidea Corliss & Levine, 1963
       Order Meiodihaplophasida Sprague, Becnel & Hazard, 1992
         Family Pereziidae Loubès, Maurand, Comps & Campillo, 1977
           1 Genus Ameson Sprague, 1977
           2 Genus Nadelspora Olson, Tiekotter & Reno, 1994 [monotypic]
           3 Genus Perezia Léger & Duboscq, 1909
           4 Genus Pernicivesicula Bylén & Larsson, 1994 [monotypic]