Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Thermodesulfobacteriota Garrity and Holt 2021
                 Class Thermodesulfobacteriaᵀ Hatchikian et al. 2002 [monotypic]
                   Order Thermodesulfobacterialesᵀ Hatchikian et al. 2002 [monotypic]
                     Family Thermodesulfobacteriaceaeᵀ Hatchikian et al. 2002
                       1 Genus Caldimicrobium Miroshnichenko et al. 2009 [monotypic]
                       2 Genus Thermodesulfatator Moussard et al. 2004 [monotypic]
                       3 Genus Thermodesulfobacteriumᵀ Zeikus et al. 1995
                       4 Genus Thermosulfurimonas Slobodkin et al. 2012
                       5 Genus "Geothermobacterium" Kashefi et al. 2002 nom. inval. [monotypic]