procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Alphaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
         Order "Sphingomonadales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Sphingomonadales Yabuuchi and Kosako 2006
           Family "Sphingomonadaceae" Kosako et al. 2000
             1 Genus Sphingomonas Yabuuchi et al. 1990
             2 Genus Blastomonas Sly and Cahill 1997
             3 Genus Erythrobacter Shiba and Simidu 1982
             4 Genus Erythromicrobium Yurkov et al. 1994 see Genus Erythrobacter Shiba and Simidu 1982
             5 Genus Erythromonas Yurkov et al. 1997 see Genus Blastomonas Sly and Cahill 1997
             6 Genus Porphyrobacter Fuerst et al. 1993 see Genus Erythrobacter Shiba and Simidu 1982
             7 Genus Rhizomonas van Bruggen et al. 1990 nom. illeg., nom. rej. see Genus Rhizorhapis Francis et al. 2014
             8 Genus Sandaracinobacter Yurkov et al. 1997 nom. inval.
             9 Genus Zymomonas Kluyver and van Niel 1936 (Approved Lists 1980)