pelobacter propionicus pelobacter propionicus pelobacter propionicus is a species of bacteria that ferments 2,3-butanediol and acetoin. it is gram-negative, strictly anaerobic and non-spore-forming. ott bd 1 is the type strain. pelobacter propionicus scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfuromonadia order: desulfuromonadales family: "pelobacteraceae" genus: pelobacter species: p. propionicus binomial name pelobacter propionicusschink 1984