[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Alphaproteobacteria 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 cryptum Harrison 1981
               2 Acidiphilium acidophilum (Harrison 1983) Hiraishi et al. 1998
               3 Acidiphilium angustum Wichlacz et al. 1986
               4 Acidiphilium multivorum Wakao et al. 1995
               5 Acidiphilium organovorum Lobos et al. 1986
               6 Acidiphilium rubrum Wichlacz et al. 1986