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 Desulfobacteria Waite et al. 2020
                   Order Desulfobacteralesᵀ Kuever et al. 2006
                     Family Desulfobacteraceaeᵀ Kuever et al. 2006
                       Genus Desulfofrigus Knoblauch et al. 1999
                         Desulfofrigus fragile Knoblauch et al. 1999