porphyromonas bennonis porphyromonas bennonis porphyromonas bennonis is a gram-negative, anaerobic and non-spore-forming bacterium from the genus of porphyromonas which has been isolated from human clinical specimens. porphyromonas bennonis scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: porphyromonadaceae genus: porphyromonas species: p. bennonis binomial name porphyromonas bennonissummanen et al. 2009 type strain atcc baa-1629, ccug 55979, jcm 16335, wal 1926c