tepidibacter formicigenes tepidibacter formicigenes tepidibacter formicigenes is a gram-positive, spore-forming and anaerobic bacterium from the genus of tepidibacter which has been isolated from hydrothermal vent fluid from the mid-atlantic ridge. tepidibacter formicigenes scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: clostridiaceae genus: tepidibacter species: t. formicigenes binomial name tepidibacter formicigenesurios et al. 2004 type strain cip 107893, dsm 15518, dv1184 synonyms tepidibacter formicogenes