Class Proteobacteria Stackebrandt et al. 1988 nom. rej. see Phylum Proteobacteria Garrity and Holt 2001 nom. nud.
   Subclass alpha see Class Alphaproteobacteria "Garrity and Holt 2001" nom. nud.
     Group 4 see Order Sphingomonadales "Garrity and Holt 2001" nom. nud.
       Family Sphingomonadaceae Kosako et al. 2000
         Genus Zymomonas Kluyver and van Niel 1936 (Approved Lists 1980)
           1 Zymomonas mobilis (Lindner 1928) Kluyver and van Niel 1936 (Approved Lists 1980)