eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Fungi R.T.Moore (1980) - fungi
     Subkingdom Eomycota Caval.-Sm. (1998) see Kingdom Fungi R.T.Moore (1980)
       Phylum Archemycota Caval.-Sm. (1998) [paraphyletic]
         Subphylum Chytridiomycotina Caval.-Sm. (2012) see Phylum Chytridiomycota Doweld (2001)
           Class Chytridiomycetes Moebius (1929)
             Subclass Neocallimastigomycetidae Caval.-Sm. (2012) [monotypic] see Class Neocallimastigomycetes M.J. Powell (2007)
               Order Neocallimastigales J.L. Li, I.B. Heath & L. Packer (1993)
                 Genus Orpinomyces D.J.S. Barr, H. Kudo, Jakober & K.J. Cheng (1989)