Opisthokonta Cavalier-Smith 1987, nom. cl. inval. see Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020]
   Holomycota Liu, Steenkamp, Brinkmann, Forget, Philippe & Lang, 2009 see Superkingdom Holomycota Liu, Steenkamp, Brinkmann, Forget, Philippe & Lang, 2009
     Superphylum Opisthosporidia Karpov, Aleoshin & Mikhailov, 2014 see Phylum Opisthosporidia Karpov, Aleoshin & Mikhailov, 2014
       Phylum Microsporidia Balbiani, 1882 see Class Microsporidea Corliss & Levine, 1963