desulfofrigus fragile desulfofrigus fragile desulfofrigus fragile is a bacterium. it is a psychrophilic gram-negative and sulfate-reducing bacteria with type strain lsv21t. desulfofrigus fragile scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfobacteria order: desulfobacterales family: desulfobacteraceae genus: desulfofrigus species: d. fragile binomial name desulfofrigus fragileknoblauch et al. 1999