prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Clostridia Rainey 2010
         Order Thermoanaerobacterales Wiegel 2010
           Family Thermoanaerobacteraceae Wiegel 2010
             01 Genus Acetogenium Leigh and Wolfe 1983 see Genus Thermoanaerobacterium Lee et al. 1993
             02 Genus Ammonifex Huber and Stetter 1996
             03 Genus Brockia Perevalova et al. 2013
             04 Genus Caldanaerobacter Fardeau et al. 2004
             05 Genus Caldanaerobius Lee et al. 2008
             06 Genus Calderihabitans Yoneda et al. 2013
             07 Genus Caloribacterium Slobodkina et al. 2012
             08 Genus Carboxydibrachium corrig. Sokolova et al. 2001
             09 Genus Carboxydothermus Svetlichny et al. 1991
             10 Genus Desulfovirgula Kaksonen et al. 2007
             11 Genus Gelria Plugge et al. 2002
             12 Genus Moorella Collins et al. 1994 nom. illeg.
             13 Genus Tepidanaerobacter Sekiguchi et al. 2006
             14 Genus Thermacetogenium Hattori et al. 2000
             15 Genus Thermanaeromonas Mori et al. 2002
             16 Genus Thermoanaerobacter Wiegel and Ljungdahl 1982
             17 Genus Thermoanaerobium Zeikus et al. 1983 see Genus Thermoanaerobacter Wiegel and Ljungdahl 1982
             18 Genus Thermobacteroides Ben-Bassat and Zeikus 1983 see Genus Thermoanaerobacter Wiegel and Ljungdahl 1982