thermofilum thermofilum in taxonomy, thermofilum is a genus of the thermofilaceae. thermofilum scientific classification domain: archaea phylum: thermoproteota class: thermoprotei order: thermofilales family: thermofilaceae genus: thermofilumzillig & gierl 1983 type species thermofilum pendenszillig and gierl 1983 species "t. adornatum" "t. carboxyditrophum" "t. librum" t. pendens thermofilum pendens is a hyperthermic member of the archael kingdom crenarchaeota, and represents a deep branch in the order thermoproteales. t. pendens lacks the genes for purine nucleotide biosynthesis and thus relies on environmental sources to meet its purine requirements. taxonomy cladogram was taken from gtdb release 06-rs202. taxonomy from list of prokaryotic names with standing in nomenclature (lpsn) and national center for biotechnology information (ncbi). thermofilaceae "infirmifilum uzonense" (toshchakov et al. 2016) zayulina et al. 2021 thermofilum t. pendens zillig & gierl 1983 "t. adornatum" dominova et al. 2013 em. zayulina et al. 2019