[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 Methanothermobacter Wasserfallen et al. 2000
               1 Methanothermobacter defluvii (Kotelnikova et al. 1994) Boone 2002
               2 Methanothermobacter marburgensis Wasserfallen et al. 2000
               3 Methanothermobacter thermautotrophicus (Zeikus and Wolfe 1972) Wasserfallen et al. 2000
               4 Methanothermobacter thermoflexus (Kotelnikova et al. 1994) Boone 2002
               5 Methanothermobacter thermophilus (Laurinavichus et al. 1990) Boone 2002
               6 Methanothermobacter wolfeii corrig. (Winter et al. 1985) Wasserfallen et al. 2000