duodenibacillus duodenibacillus duodenibacillus is a gram-negative genus of bacteria from the family of sutterellaceae with one known species (duodenibacillus massiliensis).duodenibacillus massiliensis has been isolated from the human duodenum. duodenibacillus scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: sutterellaceae genus: duodenibacillusmailhe et al. 2017 species d. massiliensis