|Bacteroides spp. anaerobically cultured in blood agar medium.|
Castellani & Chalmers 1919
Bacteroides is a genus of gram-negative bacteria. Bacteroides species are non-endospore-forming, anaerobes, and may be either motile or non-motile, depending on the species. The DNA base composition is 40-48% GC. Unusual in bacterial organisms, Bacteroides membranes contain sphingolipids. They also contain meso-diaminopimelic acid in their peptidoglycan layer.