Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Betaproteobacteria" Garrity et al. 2001 nom. ined. see Class Betaproteobacteria Garrity et al. 2006
       Order "Burkholderiales" see Order Burkholderiales Garrity et al. 2006
         Family Comamonadaceae Willems et al. 1991
           Genus Acidovorax Willems et al. 1990
           Genus Aquabacterium Kalmbach et al. 1999
           Genus Brachymonas Hiraishi et al. 1995
           Genus Delftia Wen et al. 1999
           Genus Hydrogenophaga Willems et al. 1989
           Genus Ideonella Malmqvist et al. 1994
           Genus Leptothrix Kützing 1843 (Approved Lists 1980)
           Genus Polaromonas Irgens et al. 1996
           Genus Rhodoferax Hiraishi et al. 1992
           Genus Roseateles Suyama et al. 1999
           Genus Rubrivivax Willems et al. 1991
           Genus Sphaerotilus Kützing 1833 (Approved Lists 1980)
           Genus Thiomonas Moreira and Amils 1997
           Genus Variovorax Willems et al. 1991
           1 Genus Comamonas (ex Davis and Park 1962) De Vos et al. 1985