pyramidobacter pyramidobacter pyramidobacter is a gram-negative genus of bacteria from the family of synergistaceae. pyramidobacter piscolens has been isolated from the human mouth. pyramidobacter scientific classification domain: bacteria phylum: synergistota class: synergistia order: synergistales family: synergistaceae genus: pyramidobacterdownes et al. 2009 type species pyramidobacter piscolensdownes et al. 2009 species pyramidobacter piscolens downes et al. 2009 pyramidobacter porci wylensek et al. 2021