[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Alphaproteobacteria Garrity et al. 2006
         Order Sphingomonadales Yabuuchi and Kosako 2006
           Family Sphingomonadaceae Kosako et al. 2000
             01 Genus Sphingomonas Yabuuchi et al. 1990
             01.0.1 Genus Erythromonas Yurkov et al. 1997 see Genus Blastomonas Sly and Cahill 1997
             01.0.2 Genus Rhizomonas van Bruggen et al. 1990 nom. illeg., nom. rej. see Genus Rhizorhapis Francis et al. 2014
             02 Genus Erythromicrobium Yurkov et al. 1994 see Genus Erythrobacter Shiba and Simidu 1982
             03 Genus Blastomonas Sly and Cahill 1997
             04 Genus Erythrobacter Shiba and Simidu 1982
             05 Genus Novosphingobium Takeuchi et al. 2001
             06 Genus Porphyrobacter Fuerst et al. 1993 see Genus Erythrobacter Shiba and Simidu 1982
             07 Genus Sandaracinobacter Yurkov et al. 1997 nom. inval.
             08 Genus Sandarakinorhabdus Gich and Overmann 2006
             09 Genus Sphingobium Takeuchi et al. 2001
             10 Genus Sphingopyxis Takeuchi et al. 2001
             11 Genus Sphingosinicella Maruyama et al. 2006
             12 Genus Zymomonas Kluyver and van Niel 1936 (Approved Lists 1980)