[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 Gammaproteobacteria Garrity et al. 2005
         Order Acidithiobacillales Garrity et al. 2005
           Family Acidithiobacillaceae Garrity et al. 2005
             Genus Acidithiobacillus Kelly and Wood 2000
               Acidithiobacillus caldus (Hallberg and Lindström 1995) Kelly and Wood 2000