Procaryotic Genera
Count: [*] 25p;39c;84o;215f;1008g [28 May 2016]
   Domain "Archaea" Woese et al. 1990
  Count: [*] 2p;8c;12o;21f;73g [26 May 2016]
     Phylum Euryarchaeota Garrity and Holt 2001
    Count: [*] 7c;9o;16f;50g [26 May 2016]
       Class Methanobacteria Boone 2001 nom. inval. [monotypic] see Class Methanobacteria Boone 2002
      Count: [*] 1o;2f;5g [26 May 2016]
         Order Methanobacterialesᵀ Balch and Wolfe 1981
        Count: [*] 2f;5g [26 May 2016]
           1 Family Methanobacteriaceae Barker 1956 (Approved Lists 1980)
          Count: [*] 4g [26 May 2016]
           2 Family Methanothermaceae Stetter 1982 [monotypic]
          Count: [*] 1g [26 May 2016]