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What you should know:

Methanococcus is a Gram-negative member of the Archaea with a protein cell wall.  It produces methane by oxidizing H2 gas and reducing CO2 to CH4. Methanogens are anaerobes that inhabit, among others, the rumen of cows, where they can produce up to 400 liters of methane per day!


Domain Archaea 

    Phylum Euryarchaeota

        Class Methanococci

Bergey's Manual Volume 1: The Archaea and the deeply brancing and phototrophic Bacteria