Methanogenium Romesser et al. 1981 emend. Maestrojun et al. 1990 Dataset NCBI Taxonomy Classification kingdom Methanobacteriati phylum Methanobacteriota class Methanomicrobia order Methanomicrobiales family Methanomicrobiaceae genus Methanogenium Name Homonyms Methanogenium Methanogenium Romesser et al. 1981 emend. Spring et al. 2005 Methanogenium Romesser et al. 1981 emend. Maestrojun et al. 1990