tepidibacter tepidibacter tepidibacter is a genus of gram-positive bacteria in the family clostridiaceae. tepidibacter scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: tepidibacterslobodkin et al. 2003 type species tepidibacter thalassicusslobodkin et al. 2003 species t. formicigenes t. mesophilus t. thalassicus the type species of this genus is tepidibacter thalassicus, a moderately thermophilic bacterial species isolated from deep-sea hydrothermal vents. additional species within this genus have been identified.