methanogenic bacterium

Methanogenic bacteria are a type of archaea, not bacteria, that produce methane as a metabolic byproduct. These single-celled prokaryotic organisms are distinct from true bacteria and eukaryotes. Methanogens are found in anaerobic environments such as marshes, hot springs, and the digestive tracts of animals. They play a crucial role in the carbon cycle by converting substances like carbon dioxide and hydrogen gas into methane. While often found in extreme environments, they are widespread and contribute significantly to global methane emissions.12