[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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" "Garrity and Holt 2001" nom. nud. see Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980) see Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
           Family Peptococcaceae Rogosa 1971 (Approved Lists 1980)
             Genus Thermoterrabacterium Slobodkin et al. 1997 see Genus Carboxydothermus Svetlichny et al. 1991
               Thermoterrabacterium ferrireducens Slobodkin et al. 1997 see Carboxydothermus ferrireducens (Slobodkin et al. 1997) Slobodkin et al. 2006