Methanogenium thermophilicum Dataset NCBI Taxonomy Classification phylum Euryarchaeota class Methanomicrobia order Methanomicrobiales family Methanomicrobiaceae genus Methanoculleus species Methanoculleus thermophilus Name Homonyms Methanogenium thermophilicum Methanogenium thermophilicum Rivard and Smith 1982 emend. Zabel et al. 1985