bacteroides ureolyticus bacteroides ureolyticus bacteroides ureolyticus is a species in the bacterial genus of gram-negative, obligately anaerobic bacteria. bacteroides species are non-endospore-forming bacilli, 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. bacteroides ureolyticus scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: bacteroidaceae genus: bacteroidescastellani & chalmers 1919 species: b. ureolyticus binomial name bacteroides ureolyticusjackson, 1978 bacteroides are normally mutualistic, a substantial portion of the mammalian gastrointestinal flora, and they process complex molecules into simpler ones. as many as 1010-1011 cells per gram of human feces have been reported. they can use simple sugars when available; however, the main sources of energy for bacteroides species in the gut are complex host-derived and plant glycans. pathophysiology bacteroides ureolyticus has been isolated from pregnant women with symptoms of bacterial vaginosis. other species b. acidifaciens b. distasonis (reclassified as parabacteroides distasonis) b. gracilis b. fragilis b. oris b. ovatus b. putredinis b. pyogenes b. stercoris b. suis b. tectus b. thetaiotaomicron b. thetaitamicron b. vulgatus