holdemania massiliensis holdemania massiliensis holdemania massiliensis is a gram-positive, anaerobic, non-spore-forming and non-motile bacterium from the genus holdemania which has been isolated from human feces. holdemania massiliensis scientific classification domain: bacteria phylum: bacillota class: erysipelotrichia order: erysipelotrichales family: erysipelotrichaceae genus: holdemania species: h. massiliensis binomial name holdemania massiliensismishra et al. 2013 type strain csur p195, dsm 26143, ap2 synonyms candidatus holdemania massiliensis