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?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Clostridia Rainey 2010
                   Order Clostridialesᵀ Prévot 1953 (Approved Lists 1980)
                     Genus Sulfobacillus Golovacheva and Karavaiko 1991, incertae sedis
                       1 Sulfobacillus acidophilus Norris et al. 1996
                       2 Sulfobacillus benefaciens Johnson et al. 2009
                       3 Sulfobacillus sibiricus Melamud et al. 2006
                       4 Sulfobacillus thermosulfidooxidansᵀ Golovacheva and Karavaiko 1991
                       5 Sulfobacillus thermotolerans Bogdanova et al. 2006