Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Clostridia Rainey 2010
                   Order Thermoanaerobacterales Wiegel 2010
                     Family Thermoanaerobacteraceaeᵀ Wiegel 2010
                       Genus Calderihabitans Yoneda et al. 2013
                       01 Genus Carboxydothermus Svetlichny et al. 1991
                       02 Genus Ammonifex Huber and Stetter 1996
                       03 Genus Brockia Perevalova et al. 2013 [monotypic]
                       04.1 Genus Caldanaerobacter Fardeau et al. 2004
                       04.2 Genus Carboxydibrachium corrig. Sokolova et al. 2001 [monotypic]
                       05 Genus Caloribacterium Slobodkina et al. 2012 [monotypic]
                       06 Genus Desulfovirgula Kaksonen et al. 2007 [monotypic]
                       07 Genus Gelria Plugge et al. 2002 [monotypic]
                       08 Genus Moorella Collins et al. 1994 nom. illeg.
                       09 Genus Tepidanaerobacter Sekiguchi et al. 2006 [monotypic]
                       10 Genus Thermacetogenium Hattori et al. 2000 [monotypic]
                       11 Genus Thermanaeromonas Mori et al. 2002 [monotypic]
                       12 Genus Thermoanaerobacter Wiegel and Ljungdahl 1982
                       13.2 Genus Caldanaerobius Lee et al. 2008