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 Aquificota Reysenbach 2021 [monotypic]
                 Class Aquificiaᵀ corrig. Reysenbach 2002
                   Order Aquificalesᵀ Reysenbach 2002
                     Family Hydrogenothermaceae Eder and Huber 2003
                       Genus Sulfurihydrogenibium Takai et al. 2003
                         1 Sulfurihydrogenibium azorense Aguiar et al. 2004
                         2 Sulfurihydrogenibium kristjanssonii Flores et al. 2008
                         3 Sulfurihydrogenibium rodmanii O'Neill et al. 2008
                         4 Sulfurihydrogenibium subterraneumᵀ Takai et al. 2003
                         5 Sulfurihydrogenibium yellowstonense Nakagawa et al. 2005