Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Clade neomura Cavalier-Smith, 1987 Domain Archaea Woese et al. 2024 [paraphyletic] Kingdom Methanobacteriati (Garrity and Holt 2023) Oren and Göker 2024 Phylum Methanobacteriotaᵀ Garrity and Holt 2023 Class Methanobacteriaᵀ Boone 2002 [monotypic] Order Methanobacterialesᵀ Balch and Wolfe 1981 Family Methanobacteriaceaeᵀ Barker 1956 (Approved Lists 1980) Genus Methanobacteriumᵀ Kluyver and van Niel 1936 (Approved Lists 1980) 01 Methanobacterium aarhusense Shlimon et al. 2004 02 Methanobacterium alcaliphilum Worakit et al. 1986 03 Methanobacterium arcticum Shcherbakova et al. 2011 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 ferruginis Mori and Harayama 2011 09 Methanobacterium flexile Zhu et al. 2011 10 Methanobacterium formicicumᵀ Schnellen 1947 (Approved Lists 1980) 11 Methanobacterium ivanovii Jain et al. 1988 12 Methanobacterium kanagiense Kitamura et al. 2011 13 Methanobacterium lacus Borrel et al. 2012 14 Methanobacterium movens Zhu et al. 2011 15 Methanobacterium movilense Schirmack et al. 2014 16 Methanobacterium oryzae Joulian et al. 2000 17 Methanobacterium paludis Cadillo-Quiroz et al. 2014 18 Methanobacterium palustre Zellner et al. 1990 19 Methanobacterium petrolearium Mori and Harayama 2011 20 Methanobacterium subterraneum Kotelnikova et al. 1998 21 Methanobacterium thermaggregans corrig. Blotevogel and Fischer 1988 22 Methanobacterium uliginosum König 1985 23 Methanobacterium veterum Krivushin et al. 2010