Methanogenium Dataset NCBI Taxonomy Rank GENUS Classification phylum Euryarchaeota class Methanomicrobia order Methanomicrobiales family Methanomicrobiaceae genus Methanogenium Name Synonyms Methanogenium Romesser et al. 1981 emend. Maestrojun et al. 1990 Methanogenium Romesser et al. 1981 emend. Spring et al. 2005 Homonyms Methanogenium Methanogenium Romesser et al. 1981 emend. Spring et al. 2005 Methanogenium Romesser et al. 1981 emend. Maestrojun et al. 1990