Kingdom Fungi R.T.Moore (1980) - fungi
Phylum Neocallimastigomycota M.J. Powell (2007) [monotypic]
Class Neocallimastigomycetes M.J. Powell (2007) [monotypic]
Order Neocallimastigales J.L. Li, I.B. Heath & L. Packer (1993)
Family Neocallimastigaceae I.B. Heath (1983)
1 Genus Buwchfawromyces T.M. Callaghan & G.W. Griff. (2015) [monotypic]
2 Genus Caecomyces J.J. Gold (1988)
3 Genus Cyllamyces Ozkose, B.J. Thomas, D.R. Davies, G.W. Griff. & Theodorou (2001) [monotypic]
4 Genus Neocallimastix Vávra & Joyon ex I.B. Heath (1983)
5 Genus Oontomyces Dagar, Puniya & G.W. Griff. (2015) [monotypic]
6 Genus Orpinomyces D.J.S. Barr, H. Kudo, Jakober & K.J. Cheng (1989)
7 Genus Pecoramyces Hanafy, N.H. Youssef, G.W. Griff. & Elshahed (2017) [monotypic]
8 Genus Piromyces J.J. Gold, I.B. Heath & Bauchop (1988)