| Name | Class | Order | Family | Genus |
|---|---|---|---|---|
| Methanogenium boonei | Methanomicrobia | Methanomicrobiales | Methanomicrobiaceae | Methanogenium |
| Methanogenium cariaci | Methanomicrobia | Methanomicrobiales | Methanomicrobiaceae | Methanogenium |
| Methanogenium frigidum | Methanomicrobia | Methanomicrobiales | Methanomicrobiaceae | Methanogenium |
| Methanogenium marinum | Methanomicrobia | Methanomicrobiales | Methanomicrobiaceae | Methanogenium |
| Methanogenium organophilum | Methanomicrobia | Methanomicrobiales | Methanomicrobiaceae | Methanogenium |