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FibrobacterRANK: GenusTAXONOMY: Bacteria -> FCB group -> Fibrobacteres -> Fibrobacteria -> Fibrobacterales -> Fibrobacteraceae -> Fibrobacter OVERVIEW: Cells are rod-shaped (0.3–0.5 µm × 0.8–1.6 µm) or ovoid (0.8–1.6 µm × 0.8–1.6 µm). Obligately anaerobic non-sporing and not detectably motile by microscopy. They are able to migrate through agar when growing on cellulose, suggesting a gliding form of motility. Ferment a narrow range of carbohydrates including glucose, cellobiose, and cellulose. Other sugars including lactose or maltose are fermented by a few species. The fermentation products are acetate and succinate, and sometimes formate at low levels. Cells require CO2, straight-chain and branched-chain fatty acids in the media as well as ammonia as the N source. Membranes are composed of straight-chain fatty acids, and phospholipids are predominantly ethanolamine plasmalogens. Habitat is the mammalian gastrointestinal tract.DNA G+C content (mol%): 45–51.Type species: Fibrobacter succinogenes |