prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Cardiobacteriales Garrity et al. 2005 [monotypic]
           Family Cardiobacteriaceae Dewhirst et al. 1990
             1 Genus Cardiobacterium Slotnick and Dougherty 1964 (Approved Lists 1980)
             2 Genus Dichelobacter Dewhirst et al. 1990
             3 Genus Suttonella Dewhirst et al. 1990