methanothermus methanothermus in taxonomy, methanothermus is a genus of microbes within methanothermaceae. the species within this genes are hyperthermophiles and strictly anaerobic. they produce energy through the reduction of carbon dioxide with hydrogen to produce methane. it is found in hydrothermal vents with temperatures as high as 85 °c and ph 6.5. methanothermus scientific classification domain: archaea kingdom: euryarchaeota class: methanobacteria order: methanobacteriales family: methanothermaceae genus: methanothermusstetter et al. 1982 type species methanothermus fervidusstetter et al. 1982 species m. fervidus "m. jannaschii" m. sociabilis