[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024
     Phylum "Euryarchaeota" Garrity and Holt 2002 stat. inval. see Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024
       Class "Methanomicrobia" Garrity et al. 2005 nom. inval.
         Order Methanomicrobiales Balch and Wolfe 1981
           Family Methanomicrobiaceae Balch and Wolfe 1981
             1 Genus Methanomicrobium Balch and Wolfe 1981
             2 Genus Methanoculleus Maestrojuán et al. 1990
             3 Genus Methanofollis Zellner et al. 1999
             4 Genus Methanogenium Romesser et al. 1981
             5 Genus Methanolacinia Zellner et al. 1990
             6 Genus Methanoplanus Wildgruber et al. 1984