metabacterium metabacterium metabacterium polyspora is an unusual multiple endospore-producing bacterium isolated from the cecum of guinea pigs. this bacterium is physically similar to the phylogenetically related surgeonfish intestinal symbiont epulopiscium fishelsoni. metabacterium scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: incertae sedis genus: metabacterium species: m. polyspora binomial name metabacterium polysporachatton and perard, 1913