caldimicrobium caldimicrobium caldimicrobium is a genus of bacteria from the family of thermodesulfobacteriaceae. caldimicrobium scientific classification domain: bacteria phylum: thermodesulfobacteriota class: thermodesulfobacteria order: thermodesulfobacteriales family: thermodesulfobacteriaceae genus: caldimicrobiummiroshnichenko et al. 2009 type species caldimicrobium rimae species c. rimae c. thiodismutans synonyms caldus caldimicrobium is an anaerobic thermophile which is roughly 1.0–1.2 micrometers long and 0.5 micrometers wide.