tepidibacter thalassicus tepidibacter thalassicus tepidibacter thalassicus is a bacterium from the family peptostreptococcaceae. tepidibacter thalassicus scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: tepidibacter species: t. thalassicus binomial name tepidibacter thalassicusslobodkin et al. 2003