procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Alphaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
         Order Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980)
           Family Rhodospirillaceae Pfennig and Trüper 1971 (Approved Lists 1980)
             01 Genus Rhodospirillum Molisch 1907 (Approved Lists 1980)
             02 Genus Azospirillum Tarrand et al. 1979 (Approved Lists 1980)
             03 Genus Magnetospirillum Schleifer et al. 1992
             04 Genus Phaeospirillum Imhoff et al. 1998 see Genus Magnetospirillum Schleifer et al. 1992
             05 Genus Rhodocista Kawasaki et al. 1994
             06 Genus Rhodospira Pfennig et al. 1998
             07 Genus Rhodothalassium Imhoff et al. 1998
             08 Genus Rhodovibrio (ex Molisch 1907) Imhoff et al. 1998
             09 Genus Roseospira Imhoff et al. 1998
             10 Genus Skermanella Sly and Stackebrandt 1999