[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class Methanobacteria Boone 2002
         Order Methanobacteriales Balch and Wolfe 1981
           Family Methanobacteriaceae Barker 1956 (Approved Lists 1980)
             Genus Methanobacterium Kluyver and van Niel 1936 (Approved Lists 1980)
               01 Methanobacterium formicicum Schnellen 1947 (Approved Lists 1980)
               02 Methanobacterium aarhusense Shlimon et al. 2004
               03 Methanobacterium alcaliphilum Worakit et al. 1986
               04 Methanobacterium beijingense Ma et al. 2005
               05 Methanobacterium bryantii Balch and Wolfe 1981
               06 Methanobacterium congolense Cuzin et al. 2001
               07 Methanobacterium espanolae Patel et al. 1990
               08 Methanobacterium ivanovii Jain et al. 1988
               09 Methanobacterium oryzae Joulian et al. 2000
               10 Methanobacterium palustre Zellner et al. 1990
               11 Methanobacterium subterraneum Kotelnikova et al. 1998
               12 Methanobacterium thermaggregans corrig. Blotevogel and Fischer 1988
               13 Methanobacterium uliginosum König 1985