prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   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)
           1 Family Acetobacteraceae (ex Henrici 1939) Gillis and De Ley 1980
           2 Family Rhodospirillaceae Pfennig and Trüper 1971 (Approved Lists 1980)
           3 Genus Elioraea Albuquerque et al. 2008, incertae sedis
           4 Genus Reyranella Pagnier et al. 2011, incertae sedis