caldanaerovirga caldanaerovirga caldanaerovirga is a xylanolytic, anaerobic and alkalithermophilic genus of bacteria from the family of thermosediminibacterales with one known species (caldanaerovirga acetigignens). caldanaerovirga scientific classification domain: bacteria phylum: bacillota class: clostridia order: thermosediminibacterales family: thermosediminibacteraceae genus: caldanaerovirgawagner et al. 2009 type species caldanaerovirga acetigignens species c. acetigignens