[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 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 Conglomeromonas Skerman et al. 1983 see Genus Azospirillum Tarrand et al. 1979 (Approved Lists 1980)
             04 Genus Defluviicoccus corrig. Maszenan et al. 2005
             05 Genus Inquilinus Coenye et al. 2002
             06 Genus Magnetospirillum Schleifer et al. 1992
             07 Genus Phaeospirillum Imhoff et al. 1998 see Genus Magnetospirillum Schleifer et al. 1992
             08 Genus Rhodocista Kawasaki et al. 1994
             09 Genus Rhodospira Pfennig et al. 1998
             10 Genus Rhodovibrio (ex Molisch 1907) Imhoff et al. 1998
             11 Genus Roseospira Imhoff et al. 1998
             12 Genus Skermanella Sly and Stackebrandt 1999
             13 Genus Thalassospira López-López et al. 2002
             14 Genus Tistrella Shi et al. 2003