Methanosphaera stadtmanae is a methanogen archaeon. It is a non-motile, Gram-positive, spherical-shaped organism that obtains energy by using hydrogen to reduce methanol to methane. It does not possess cytochromes and is part of the large intestine's biota.
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Further reading
External links
Type strain of Methanosphaera stadtmanae at BacDive - the Bacterial Diversity Metadatabase