life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokarya see Domain Bacteria Woese et al. 1990 stat. inval.
     Kingdom Bacteria Cavalier-Smith 1998 nom. inval. - bacteria see Kingdom Bacteria Cavalier-Smith 2002 stat. inval.
       Subkingdom Archaea Woese et al. 1990 see Domain Archaea Woese et al. 1990 stat. inval.
         Division Mendosicutes Murray 1984 see Domain Archaea Woese et al. 1990 stat. inval.
           Phylum Euryarchaeota Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
             methanogens see Phylum Euryarchaeota Garrity and Holt 2002 stat. inval.
               Genus Methanococcus Kluyver and van Niel 1936 (Approved Lists 1980)