Scanning electron micrograph of F. prausnitzii strain A2165. Bar, 1 µm. - Source:2Fermentation
Strains belonging to the sole species of the genus Faecalibacterium are strictly anaerobic bacteria, with a fermentative type of metabolism. Butyrate, D-lactate and formate are products of glucose fermentation. Acetate is utilized by all strains. Strains Fusobacterium prausnitzii ATCC 27768T and 27766, A2-165 and L2-6 are able to hydrolyze fructose, fructose-oligosaccharides, starch and inulin. Variable length, straight, rod‐shaped cells (0.5–0.8 × 2.0–14.0 µm) mainly occur singly and sometimes seen as hourglass‐shaped 3. No physiological information has been determined for the genus in situ in activated sludge.
 Duncan, Hold, Harmsen, Stewart, Flint (2002): Growth requirements and fermentation products of Fusobacterium prausnitzii, and a proposal to reclassify it as Faecalibacterium prausnitzii gen. nov., comb. nov. Int. J. Syst. Evol. Microbiol. 52 (Pt 6): 2141-6. doi:10.1099/00207713-52-6-2141
 Lopez-Siles, Duncan, Garcia-Gil, Martinez-Medina (2017): Faecalibacterium prausnitzii: from microbiology to diagnostics and prognostics. ISME J 11 (4): 841-852. doi:10.1038/ismej.2016.176