eubacterium barkeri eubacterium barkeri eubacterium barkeri, previously known as clostridium barkeri, is a bacterium belonging to the bacillota. eubacterium barkeri scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: eubacteriaceae genus: eubacterium species: e. barkeri binomial name eubacterium barkeri(stadtman et al. 1972) collins et al. 1994 synonyms clostridium barkeri