organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990 stat. inval.
     Phylum Methaneocreatrices Margulis and Schwartz 1982 nom. ined. see Phylum Euryarchaeota Garrity and Holt 2002 stat. inval.
       Genus Methanobacillus Barker 1956 nom. inval.
       1 Genus Methanosarcina Kluyver and van Niel 1936 (Approved Lists 1980)
       2 Genus Methanobacterium Kluyver and van Niel 1936 (Approved Lists 1980)
       3 Genus Methanococcus Kluyver and van Niel 1936 (Approved Lists 1980)