[1] The species within Methanobrevibacter are strictly anaerobic archaea that produce methane, for the most part through the reduction of carbon dioxide via hydrogen.

Most species live in the intestines of larger organisms, such as termites and are responsible for the large quantities of greenhouse gases that they produce.

[5] The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [6] and National Center for Biotechnology Information (NCBI).

[1] M. cuticularis Leadbetter & Breznak 1997 M. curvatus Leadbetter & Breznak 1997 M. filiformis Leadbetter & Breznak 1997 M. olleyae Rea et al. 2007 M. ruminantium (Smith & Hungate 1958) Balch & Wolfe 1981 M. smithii Balch & Wolfe 1981 M. millerae Rea et al. 2007 M. gottschalkii Miller & Lin 2002 M. thaueri Miller & Lin 2002 M. woesei Miller & Lin 2002 M. acididurans Savant et al. 2002 M. arboriphilus corrig.

(Zeikus & Henning 1975) Balch & Wolfe 1981 M. boviskoreani Lee et al. 2013 M. wolinii Miller & Lin 2002 "Methanacia filiformis" (Leadbetter, Crosby & Breznak 1998) Protasov & Brune 2023 "Ca.