Procaryotic Genera
Ref: G.M. Garrity et al., 2001b: 1; Count: [*] 25p;39c;84o;215f;1008g [28 May 2016]
   Domain "Archaea" Woese et al. 1990
  Ref: G.M. Garrity et al., 2001b: 1; Count: [*] 2p;8c;12o;21f;73g [26 May 2016]
     Phylum Euryarchaeota Garrity and Holt 2001
    Ref: G.M. Garrity et al., 2001b: 1 [new taxon]; Count: [*] 7c;9o;16f;50g [26 May 2016]
       Class Methanobacteria Boone 2001 nom. inval. [monotypic] see Class Methanobacteria Boone 2002
      Ref: G.M. Garrity et al., 2001b: 1 [new taxon]; Count: [*] 1o;2f;5g [26 May 2016]
         Order Methanobacterialesᵀ Balch and Wolfe 1981
        Ref: G.M. Garrity et al., 2001b: 1 [new position]; Count: [*] 2f;5g [26 May 2016]
           Family Methanobacteriaceae Barker 1956 (Approved Lists 1980)
          Ref: G.M. Garrity et al., 2001b: 1; Count: [*] 4g [26 May 2016]
             Genus Methanobacteriumᵀ Kluyver and van Niel 1936 (Approved Lists 1980)
            Ref: G.M. Garrity et al., 2001b: 1; Count: -