Procaryotic Genera Domain "Bacteria" Woese et al. 1990 Phylum Bacteroidetes Garrity and Holt 2001 see Phylum Bacteroidetes Krieg et al. 2012 Class "Bacteroidetes" Krieg et al., 2012 [monotypic] see Class Bacteroidia Krieg et al., 2012 Order "Bacteroidales" Krieg 2012 see Order Bacteroidales Krieg 2012 Family Bacteroidaceae Pribram 1933 (Approved Lists 1980) Genus Bacteroides Castellani and Chalmers 1919 (Approved Lists 1980)