prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Firmicutes" (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval. see Phylum Bacillota Gibbons and Murray 2021
       Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980) see Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
           Family Syntrophomonadaceae Zhao et al. 1993
             1 Genus Dethiobacter Sorokin et al. 2008
             2 Genus Fervidicola Ogg and Patel 2009
             3 Genus Pelospora Matthies et al. 2000
             4 Genus Syntrophomonas McInerney et al. 1982
             5 Genus Syntrophospora Zhao et al. 1990
             6 Genus Syntrophothermus Sekiguchi et al. 2000
             7 Genus Thermohydrogenium Zacharova et al. 1996
             8 Genus Thermosyntropha Svetlitshnyi et al. 1996