thermofilaceae thermofilaceae in taxonomy, the thermofilaceae are a family of the thermoproteales. thermofilaceae scientific classification domain: archaea kingdom: proteoarchaeota superphylum: tack group phylum: thermoproteota class: thermoprotei order: thermofilales family: thermofilaceaeburggraf, huber & stetter 1997 family infirmifilum thermofilum