desulfofrigus desulfofrigus desulfofrigus is a gram-negative, strictly anaerobic and non-spore-forming bacteria genus from the family of desulfobacteraceae. desulfofrigus scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfobacteria order: desulfobacterales family: desulfobacteraceae genus: desulfofrigusknoblauch et al. 1999 type species desulfofrigus oceanense species d. fragile d. oceanense