Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Rozellomycota Doweld (2013)
     Class Microsporidea Corliss & Levine, 1963
       Order Meiodihaplophasida Sprague, Becnel & Hazard, 1992
         Family Thelohaniidae Hazard & Oldacre, 1975
           Genus Paradoxium Stentiford, Ross, Kerr, Bass & Bateman, 2015 [monotypic]
             Paradoxium irvingiᵀ Stentiford, Ross, Kerr, Bass & Bateman