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