Syntrophomonadaceae Zhao et al. 1993 emend. Zhang et al. 2019 Syntrophomonadaceae Zhao et al. 1993 emend. Zhang et al. 2019 Syntrophomonas McInerney et al. 1982 emend. Wu et al. 2006 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 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Syntrophomonadaceae Zhao et al. 1993 emend. Zhang et al. 2019 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Eubacteriaceae Ludwig et al. 2010 Caldicoprobacteraceae Yokoyama et al. 2010 Christensenellaceae Morotomi et al. 2012 Clostridiaceae Pribram 1933 (Approved Lists 1980) emend. Spring 2021 Defluviitaleaceae Jabari et al. 2012 Gracilibacteraceae Lee et al. 2010 Heliobacteriaceae Asao and Madigan 2010 Lachnospiraceae Rainey 2010 Peptococcaceae Rogosa 1971 (Approved Lists 1980) emend. Lv et al. 2020 Peptostreptococcaceae Ezaki 2010 Ruminococcaceae Rainey 2010 Eubacteriineae Breed et al. 1944 (Approved Lists 1980) Oscillospiraceae Peshkoff 1940 (Approved Lists 1980) emend. Tindall 2019 Incertae sedis 723 Hitch et al. 2021 Syntrophomonas McInerney et al. 1982 emend. Wu et al. 2006 Thermosyntropha Svetlitshnyi et al. 1996 Syntrophothermus Sekiguchi et al. 2000 Pelospora Matthies et al. 2000 Fervidicola Ogg and Patel 2009 Syntrophospora Zhao et al. 1990 Thermohydrogenium Zacharova et al. 1996 Caldanaerovirga Wagner et al. 2009 Dethiobacter Sorokin et al. 2008 Anaerospora Woo et al. 2016 Desulfosporomusa Sass et al. 2004 Psychrosinus Sattley et al. 2008 Contubernalis Zhilina et al. 2005 Syntrophonatronum Sorokin et al. 2014 Syntrophocurvum Sorokin et al. 2016 Syntrophofaba Sorokin et al. 2016 Syntropholuna Sorokin et al. 2016 Rainey F.A. De Vos P. Garrity G. Jones D. Krieg N.R. Ludwig W. Rainey F.A. Schleifer K.H. Whitman W.B. Order I. 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