[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 Rhodospirillaceae Pfennig and Trüper 1971 (Approved Lists 1980)
             Genus Phaeospirillum Imhoff et al. 1998
               1 Phaeospirillum fulvum (van Niel 1944) Imhoff et al. 1998
               2 Phaeospirillum molischianum (Giesberger 1947) Imhoff et al. 1998