caloranaerobacter caloranaerobacter caloranaerobacter is a gram-negative, thermophilic, anaerobic and chemoorganotrophic bacterial genus from the family of clostridiaceae. caloranaerobacter scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: clostridiaceae genus: caloranaerobacterwery et al. 2001 type species caloranaerobacter azorensis species c. azorensis c. ferrireducens