cloacibacillus cloacibacillus cloacibacillus is a gram-negative and anaerobic genus of bacteria from the family of synergistaceae. cloacibacillus bacteria are pathogenic. cloacibacillus scientific classification domain: bacteria phylum: synergistota class: synergistia order: synergistales family: synergistaceae genus: cloacibacillusganesan et al. 2008 type species cloacibacillus evryensisganesan et al. 2008 species c. evryensis c. porcorum