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Bacteroides are Gram-negative anaerobic rods commonly found in the mouth & intestine of animals. They are extremely abundant in the rumen of the diary cow. Not surprisingly, their metabolism is primarily chemoheterotrophic / fermentative.
Bergey's Manual Volume 4: The Bacteroidetes, Spirochaetes, Tenericutes (Mollicutes), Acidobacteria, Fibrobacteres, Fusobacteria, Dictyoglomi, Gemmatimonadetes, Lentisphaerae, Verrucomicrobia, Chlamydiae, and Planctomycetes