Methanogenium frigidum Dataset NCBI Taxonomy Rank SPECIES Classification phylum Euryarchaeota class Methanomicrobia order Methanomicrobiales family Methanomicrobiaceae genus Methanogenium species Methanogenium frigidum Name Synonyms Methanogenium frigidum Franzmann et al. 1997 Homonyms Methanogenium frigidum Methanogenium frigidum SMCC 459W Methanogenium frigidum Franzmann et al. 1997