prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
Count: [*] 34p;74c;164o;358f;2552g [13 Sep 2017]
   Domain "Archaea" Woese et al. 1990
  Count: [*] 5p;10c;19o;32f;129g [6 Sep 2017]
     Phylum "Euryarchaeota" Garrity and Holt 2001
    Count: [*] 8c;12o;22f;97g [6 Sep 2017]
       Class Methanobacteria Boone 2002 [monotypic]
      Count: [*] 1o;2f;5g [6 Sep 2017]
         Order Methanobacteriales Balch and Wolfe 1981
        Count: [*] 2f;5g [6 Sep 2017]
           1 Family Methanobacteriaceae Barker 1956 (Approved Lists 1980)
          Count: [*] 4g [6 Sep 2017]
           2 Family Methanothermaceae Stetter 1982 [monotypic]
          Count: [*] 1g [6 Sep 2017]