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. In pure culture, cells appear as straight rods. 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