[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class "Clostridia" Garrity et al. 2001 nom. ined. see Class Clostridia Rainey 2010
         Order "Thermoanaerobacteriales" see Order Thermoanaerobacterales Wiegel, 2010
           Family "Thermoanaerobacteriaceae" see Family Thermoanaerobacteraceae Wiegel, 2010
             Genus Thermoanaerobacter Wiegel and Ljungdahl 1982
               01 Thermoanaerobacter ethanolicus Wiegel and Ljungdahl 1982
               02 Thermoanaerobacter acetoethylicus (Ben-Bassat and Zeikus 1983) Rainey and Stackebrandt 1993
               03 [Thermoanaerobacter brockii] (Zeikus et al. 1983) Lee et al. 1993
               04 Thermoanaerobacter italicus Kozianowski et al. 1998
               05 Thermoanaerobacter kivui (Leigh and Wolfe 1983) Collins et al. 1994
               06 Thermoanaerobacter mathranii Larsen et al. 1998
               07 Thermoanaerobacter siderophilus Slobodkin et al. 1999
               08 Thermoanaerobacter sulfurophilus Bonch-Osmolovskaya 1998
               09 Thermoanaerobacter thermocopriae (Jin et al. 1988) Collins et al. 1994
               10 Thermoanaerobacter thermohydrosulfuricus (Klaushofer and Parkkinen 1965) Lee et al. 1993
               11 Thermoanaerobacter wiegelii Cook et al. 1996