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
       1 Phylum Aphelida Karpov, Aleoshin & Mikhailov, 2014 [monotypic] see Phylum Aphelidiomycota Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, M. Döring, Schigel, T.W. May, M. Ryberg & Abarenkov (2018)
       2.1 Phylum Cryptomycota Jones & Richards (2011) [monotypic] see Phylum Rozellomycota Doweld (2013)
       2.2 Phylum Microsporidia Balbiani, 1882 see Class Microsporidea Corliss & Levine, 1963