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
     Phylum Methaneocreatrices Margulis and Schwartz 1982 see Phylum Euryarchaeota Garrity and Holt 2001
       Genus Methanobacterium Kluyver and van Niel 1936 (Approved Lists 1980)
         Methanobacterium ruminantium Smith and Hungate 1958 (Approved Lists 1980) see Methanobrevibacter ruminantium (Smith and Hungate 1958) Balch and Wolfe 1981