| Methanobacteriaceae |
a family of methane-producing bacteria, made up of coccoid or rod-shaped, strictly anaerobic cells that obtain energy by the formation of methane. The Methanobacteriaceae are grouped with the archaeobacteria because they lack muramic acid in their cell walls and differ from other bacteria in ribosomal RNA and cell lipid structures. They are found in sewage sludge, mud, and the rumens of cattle and sheep. The family contains the genera Methanobacterium, Methanococcus, and Methanosarcina.
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