Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 1990 [paraphyletic]
               Phylum Euryarchaeota Garrity and Holt 2001
                 Class "Methanomicrobia"
                   Order Methanomicrobialesᵀ Balch and Wolfe 1981
                     Family Methanomicrobiaceaeᵀ Balch and Wolfe 1981
                       1.1 Genus Methanomicrobiumᵀ Balch and Wolfe 1981 [monotypic]
                       1.2 Genus Methanolacinia Zellner et al. 1990
                       2 Genus Methanoculleus Maestrojuán et al. 1990
                       3 Genus Methanofollis Zellner et al. 1999
                       4 Genus Methanogenium Romesser et al. 1981
                       5 Genus Methanoplanus Wildgruber et al. 1984