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?]
             Phylum "Deltaproteobacteria" Kuever et al., 2006 [polyphyletic]
               Class Thermodesulfobacteria Hatchikian et al. 2002 [monotypic]
                 Order Thermodesulfobacterialesᵀ Hatchikian et al. 2002 [monotypic]
                   Family Thermodesulfobacteriaceaeᵀ Hatchikian et al. 2002
                     Genus Thermodesulfobacteriumᵀ Zeikus et al. 1995
                       Thermodesulfobacterium thermophilum (Rozanova and Khudyakova 1974) Rozanova and Pivovarova 1995