[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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
           Family Cardiobacteriaceae Dewhirst et al. 1990
             Genus Cardiobacterium Slotnick and Dougherty 1964 (Approved Lists 1980)
               1 Cardiobacterium hominis Slotnick and Dougherty 1964 (Approved Lists 1980)
               2 Cardiobacterium valvarum Han et al. 2004