Domain Archaea Woese et al. 1990
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   Phylum Euryarchaeota Garrity and Holt 2001
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     Class Methanobacteria Boone 2001 nom. inval. see Class Methanobacteria Boone 2002
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       Order Methanobacteriales Balch and Wolfe 1981
      Count: -
         Family Methanobacteriaceae Barker 1956 (Approved Lists 1980)
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           Genus Methanobacterium Kluyver and van Niel 1936 (Approved Lists 1980)
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