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 "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
                     Family Acetobacteraceae (ex Henrici 1939) Gillis and De Ley 1980
                       Genus Acidiphilium Harrison 1981
                         1 Acidiphilium acidophilum (Harrison 1983) Hiraishi et al. 1998
                         2 Acidiphilium angustum Wichlacz et al. 1986
                         3 Acidiphilium cryptumᵀ Harrison 1981
                         4 Acidiphilium multivorum Wakao et al. 1995
                         5 Acidiphilium organovorum Lobos et al. 1986
                         6 Acidiphilium rubrum Wichlacz et al. 1986