bacillus mesentericus bacillus mesentericus bacillus mesentericus is a gram-positive species of bacteria. strains of this species may contaminate bread dough, forming a sticky, rope-like texture. bacillus mesentericus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. mesentericus binomial name bacillus mesentericustrevisan this species has been experimentally explored as a potential probiotic.