porphyromonas levii porphyromonas levii porphyromonas levii is a gram-negative, anaerobic bacterium from the genus porphyromonas, which has been isolated from a bovine rumen. porphyromonas levii scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: porphyromonadaceae genus: porphyromonas species: p. levii binomial name porphyromonas levii(johnson and holdeman 1983) shah et al. 1995 type strain acm 5042, atcc 29147, ccug 21027, ccug 34320, hambi 467, jcm 13866, lev, lev 1, nctc 11028, vpi 10450, vpi 3300 synonyms bacteroides melaninogenicus subsp. levi, bacteroides levii,