Domain Bacteria Woese et al. 1990
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   Phylum Bacteroidetes Garrity and Holt 2001 see Phylum Bacteroidetes Krieg et al. 2012
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     Class "Bacteroides" Castellani & Chalmers, 1919 emend. Shah & Collins, 1989 emend. Shah & Collins, 1989 see Class Bacteroidia Krieg et al., 2012
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       Order "Bacteroidales" Krieg 2012 see Order Bacteroidales Krieg 2012
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         Family Bacteroidaceae Pribram 1933 (Approved Lists 1980)
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           Genus Bacteroides Castellani and Chalmers 1919 (Approved Lists 1980)
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