Domain Bacteria Woese et al. 1990
   Phylum Bacteroidetes Garrity and Holt 2001 see Phylum Bacteroidetes Krieg et al. 2012
     1 Class "Bacteroides" Castellani & Chalmers, 1919 emend. Shah & Collins, 1989 emend. Shah & Collins, 1989 see Class Bacteroidia Krieg et al., 2012
     2 Class "Flavobacteria" see Class Flavobacteriia Bernardet 2012
     3 Class "Sphingobacteria" see Class Sphingobacteriia Kämpfer 2012