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 Methanococci Boone 2001 nom. inval. see Class Methanococci Boone 2002
      Count: [*] 3o;7f;21g [26 May 2016]
         Order Methanococcalesᵀ Balch and Wolfe 1981
        Count: [*] 2f;4g [26 May 2016]
           Family Methanococcaceae Balch and Wolfe 1981
          Count: [*] 2g [26 May 2016]
             Genus Methanococcusᵀ Kluyver and van Niel 1936 (Approved Lists 1980)
            Count: -