Kingdom Fungi R.T.Moore (1980) - fungi Phylum Neocallimastigomycota M.J. Powell (2007) 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)