Thermoanaerobium Zeikus et al. 1983 Thermoanaerobium brockii Zeikus et al. 1983 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Firmicutes (sic) Gibbons and Murray 2021 Bacillota corrig. Gibbons and Murray 2021 Firmacutes (sic) Gibbons and Murray 2021 Clostridia Rainey 2010 Thermoanaerobacterales (Garrity and Holt 2001) Wiegel 2010 emend. Lv et al. 2020 Thermoanaerobacteraceae (Garrity and Holt 2001) Wiegel 2010 Thermoanaerobium Zeikus et al. 1983 Thermoanaerobacteraceae (Garrity and Holt 2001) Wiegel 2010 Tepidanaerobacter Sekiguchi et al. 2006 emend. Westerholm et al. 2011 Desulfovirgula Kaksonen et al. 2007 Carboxydobrachium (sic) Sokolova et al. 2001 Carboxydibrachium corrig. Sokolova et al. 2001 Ammonifex Huber et al. 1996 emend. Miroshnichenko et al. 2008 Caldanaerobacter Fardeau et al. 2004 Gelria Plugge et al. 2002 Thermobacteroides Ben-Bassat and Zeikus 1983 emend. Ollivier et al. 1985 Carboxydothermus Svetlichny et al. 1991 emend. Novikov et al. 2011 Acetogenium Leigh and Wolfe 1983 Thermovorax Mäkinen et al. 2012 Caloribacterium Slobodkina et al. 2012 Brockia Perevalova et al. 2013 Calderihabitans Yoneda et al. 2013 Thermoanaerobacter Wiegel and Ljungdahl 1982 emend. Lee et al. 2007 Thermodesulfitimonas Slobodkina et al. 2017 Moorella Collins et al. 1994 Thermacetogenium Hattori et al. 2000 Thermanaeromonas Mori et al. 2002 Caldanaerobius Lee et al. 2008 Desulfothermobacter Frolov et al. 2018 Carbobacillus (sic) Kadnikov et al. 2018 Carbonibacillus corrig. Kadnikov et al. 2018 Calorimonas Khomyakova et al. 2020 Thermoanaerobium brockii Zeikus et al. 1983 Thermoanaerobium acetigenum Nielsen et al. 1994 Nielsen P. Mathrani I.M. Ahring B.K. Thermoanaerobium acetigenum spec. nov., a new anaerobic, extremely thermophilic, xylanolytic non-spore-forming bacterium isolated from an Icelandic hot spring. 1993 159 460 464 Archives of Microbiology Arch Microbiol 0302-8933 1432-072X 10.1007/BF00288594 Wiegel J. De Vos P. Garrity G. Jones D. Krieg N.R. Ludwig W. Rainey F.A. Schleifer K.H. Whitman W.B. Family I. Thermoanaerobacteraceae fam. nov. 2009 3 2 1225 Bergey's Manual of Systematic Bacteriology Springer-Verlag New York Garrity G.M. Holt J.G. Garrity G.M. Boone D.R. Castenholz R.W. Taxonomic Outline of the Archaea and Bacteria. 2001 1 2 155 166 Bergey's Manual of Systematic Bacteriology Springer New York Zeikus J.G. Hegge P.W. Anderson M.A. Thermoanaerobium brockii gen. nov., sp. nov., a new chemoorganothrophic caldoactive anaerobic bacterium. 1979 122 41 48 Archives of Microbiology Arch Microbiol 0302-8933 1432-072X 10.1007/BF00408044