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n. Any of various archaea that are capable of producing methane from the decomposition of organic material.

n. any of various archaebacteria capable of methanogenesis

n. A type of archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage, and capable of producing methane; a source of natural gas.

n. archaebacteria found in anaerobic environments such as animal intestinal tracts or sediments or sewage and capable of producing methane; a source of natural gas

"The Mars methane release would, in this scenario, occur when the right climatic conditions arrive for an explosion of the methanogen population, or it could come from a melting of surface ice that then allows subterranean, bacteria-produced methane to escape."

archaebacteria    archaebacterium    archeobacteria    archaeobacteria