pseudobutyrivibrio xylanivorans pseudobutyrivibrio xylanivorans pseudobutyrivibrio xylanivorans is a species of butyrate-producing bacteria from the rumen. it is gram-negative, anaerobic, non-spore-forming, curved rod-shaped and motile by means of a single polar or subpolar flagellum. its type strain is mz 5t (=dsm 14809t =atcc baa-455t). xylanivorans means xylan-digesting. pseudobutyrivibrio xylanivorans scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: lachnospiraceae genus: pseudobutyrivibrio species: p. xylanivorans binomial name pseudobutyrivibrio xylanivoranskopecný et al. 2003