Six genera of hydrogenotrophic methanogens, namely Methanobrevibacter, Methanobacterium, Methanocorpusculum, Methanothermobacter, Methanoculleus, and Methanospirillum were cultivated from diverse environmental niches like rumen, feces, gut, and sediments using BY medium. We also report a putative novel genus and two novel species of methanogens isolated from termite, Indian star tortoise, and green iguana.
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