[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         Order Hydrogenophilales Garrity et al. 2006
           Family Hydrogenophilaceae Garrity et al. 2006
             Genus Thiobacillus Beijerinck 1904 (Approved Lists 1980)
               Thiobacillus denitrificans (ex Beijerinck 1904) Kelly and Harrison 1989