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 Order "Bacteroidales" Krieg 2012 see Order Bacteroidales Krieg 2012 Family Bacteroidaceae Pribram 1933 (Approved Lists 1980) Genus Acetofilamentum Dietrich et al. 1989 Genus Acetomicrobium Soutschek et al. 1985 Genus Acetothermus Dietrich et al. 1988 Genus Anaerorhabdus Shah and Collins 1986 Genus Megamonas Shah and Collins 1983 1 Genus Bacteroides Castellani and Chalmers 1919 (Approved Lists 1980)