tepidibacter mesophilus tepidibacter mesophilus tepidibacter mesophilus is a bacterium from the family peptostreptococcaceae. tepidibacter mesophilus scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: tepidibacter species: t. mesophilus binomial name tepidibacter mesophilustan et al. 2012