Domain Bacteria Woese et al. 1990
   Phylum Bacteroidetes Garrity and Holt 2001 see Phylum Bacteroidetes Krieg et al. 2012
     Class "Bacteroides" Castellani & Chalmers, 1919 emend. Shah & Collins, 1989 emend. Shah & Collins, 1989 see Class Bacteroidia Krieg et al., 2012
       1 Order "Bacteroidales" Krieg 2012 see Order Bacteroidales Krieg 2012