bifidobacterium ruminantium bifidobacterium ruminantium bifidobacterium ruminantium is a bacterium found in bovine rumens. bifidobacterium ruminantium scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: bifidobacteriales family: bifidobacteriaceae genus: bifidobacterium species: b. ruminantium binomial name bifidobacterium ruminantiumbiavati and mattarelli 1991