desulfurococcales desulfurococcales the desulfurococcales are an order of the thermoprotei, part of the kingdom archaea. the order encompasses some genera which are all thermophilic, autotrophs which utilise chemical energy, typically by reducing sulfur compounds using hydrogen. desulfurococcales scientific classification domain: archaea kingdom: proteoarchaeota superphylum: tack group phylum: thermoproteota class: thermoprotei order: desulfurococcaleshuber & stetter 2002 families desulfurococcaceae "ignicoccaceae" "ignisphaeraceae" pyrodictiaceae synonyms "igneococcales" (sic) burggraf, huber & stetter 1997 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_12_2021 53 marker proteins based gtdb 07-rs207 fervidicoccales fervidicoccaceae fervidicoccus "ignicoccaceae" ignicoccus desulfurococcaceae clade 2 "ignisphaeraceae" ignisphaera pyrodictiaceae desulfurococcaceae acidilobales caldisphaeraceae caldisphaera acidilobaceae acidilobus sulfolobales sulfolobaceae desulfurococcales sulfolobales fervidicoccaceae fervidicoccus "ignicoccaceae" ignicoccus acidilobaceae aeropyrum caldisphaera acidilobus pyrodictiaceae desulfurococcaceae ignisphaera zestosphaera sulfolobaceae