thermodiscus thermodiscus in taxonomy, thermodiscus is a genus of the desulfurococcaceae. thermodiscus scientific classification domain: archaea kingdom: proteoarchaeota superphylum: tack group phylum: thermoproteota class: thermoprotei order: sulfolobales family: acidilobaceae genus: thermodiscusstetter 2003 type species thermodiscus maritimusstetter 2003 species t. maritimus