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 "Proteobacteria" Craig et al. 2010
               Phylum "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Chromatiales Imhoff 2005
                     Family Halothiobacillaceae Kelly and Wood 2005
                       Genus Halothiobacillusᵀ Kelly and Wood 2000
                         1 Halothiobacillus halophilus (Wood and Kelly 1995) Kelly and Wood 2000
                         2 Halothiobacillus hydrothermalis (Durand et al. 1997) Kelly and Wood 2000
                         3 Halothiobacillus kellyi Sievert et al. 2000
                         4 Halothiobacillus neapolitanus (Parker 1957) Kelly and Wood 2000