caldanaerobius caldanaerobius caldanaerobius is a genus of thermophilic, obligately anaerobic bacteria from the family of thermoanaerobacteraceae. caldanaerobius scientific classification domain: bacteria phylum: bacillota class: clostridia order: thermoanaerobacterales family: thermoanaerobacteraceae genus: caldanaerobiuslee et al. 2008 type species caldanaerobius fijiensislee et al. 2008 species c. fijiensis c. polysaccharolyticus c. zeae synonyms caldanaerobium (sic) phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn) and national center for biotechnology information (ncbi) 16s rrna based ltp_01_2022 120 marker proteins based gtdb 07-rs207 c. fijiensis lee et al. 2008 c. polysaccharolyticus (cann et al. 2001) lee et al. 2008 c. zeae (cann et al. 2001) lee et al. 2008 c. fijiensis c. polysaccharolyticus