holdemania holdemania holdemania is a gram-positive, strictly anaerobic and non-spore-forming genus from the family of erysipelotrichaceae, with two known species: holdemania filiformis and holdemania massiliensis. holdemania scientific classification domain: bacteria phylum: bacillota class: erysipelotrichia order: erysipelotrichales family: erysipelotrichaceae genus: holdemaniawillems et al. 1997 type species holdemania filiformiswillems et al. 1997 species h. filiformis h. massiliensis