the root (no rank)
Archaea (domain)
Euryarchaeota (phylum)
Methanobacteriales (order)
Methanobacteriaceae (family)
Methanobacterium (genus)
[hide inferior taxa]
Methanobacterium barkeri (species)
Methanobacterium bryantii (species)
Methanobacterium fervidus (species)
Methanobacterium formicicum (species)
Methanobacterium ivanovii (species)
Methanobacterium kandleri (species)
Methanobacterium sp. (species)
Methanobacterium thermoautotrophicum (species)
Methanobacterium thermoformicicum (species)
Methanobacterium wolfei (species)