[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 Sphingomonadales Yabuuchi and Kosako 2006
           Family Sphingomonadaceae Kosako et al. 2000
             Genus Sphingobium Takeuchi et al. 2001
               Sphingobium xenophagum (Stolz et al. 2000) Pal et al. 2006