Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Chytridiomycota Doweld (2001)
     Class Polychytriomycetes Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, M. Döring, Schigel, T.W. May, M. Ryberg & Abarenkov (2018) [monotypic]
       Order Polychytriales Longcore & D.R. Simmons (2012)
         1 Family Arkayaceae Doweld (2014) [monotypic]
         2 Family Polychytriaceae Doweld (2014)