thermovirga thermovirga thermovirga is a gram-negative, anaerobic and motile genus of bacteria from the family of synergistaceae with one known species (thermovirga lienii). thermovirga lienii has been isolated from production water from an oil well from the north sea in norway. thermovirga scientific classification domain: bacteria phylum: synergistota class: synergistia order: synergistales family: synergistaceae genus: thermovirgadahle and birkeland 2006 type species thermovirga lienii species t. lienii