desulfonema desulfonema desulfonema is a gram-negative bacteria genus from the family desulfococcaceae. desulfonema scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfobacteria order: desulfobacterales family: desulfococcaceae genus: desulfonemawiddel 1981 type species desulfonema limicola species d. ishimotonii d. limicola d. magnum