clostridium piliforme clostridium piliforme clostridium piliforme is an anaerobic, motile, gram-negative bacterium. it is the causing agent of tyzzer's disease in various mammals. clostridium piliforme scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: clostridiaceae genus: clostridium species: c. piliforme binomial name clostridium piliforme(ex tyzzer 1917) duncan et al. 1993 synonyms bacillus piliformis "tyzzerella piliformis" (duncan et al. 1993) yutin and galperin 2013 taxonomy c. piliforme was assigned to the genus clostridium, where it was later ordered to the cluster xivb, being closely related to c. colinum. in 2013, it was proposed to be moved to the new genus "tyzzerella" in the family of lachnospiraceae.