[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 Rhizobiales Kuykendall 2006
           Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
             Genus Xanthobacter Wiegel et al. 1978 (Approved Lists 1980)
               1 Xanthobacter autotrophicus (Baumgarten et al. 1974) Wiegel et al. 1978 (Approved Lists 1980)
               2 Xanthobacter agilis Jenni and Aragno 1988
               3 Xanthobacter aminoxidans Doronina and Trotsenko 2003
               4 Xanthobacter flavus Malik and Claus 1979 (Approved Lists 1980)
               5 Xanthobacter tagetidis Padden et al. 1997
               6 Xanthobacter viscosus Doronina and Trotsenko 2003