Methanococcus Dataset NCBI Taxonomy Rank GENUS Classification kingdom Methanobacteriati phylum Methanobacteriota class Methanococci order Methanococcales family Methanococcaceae genus Methanococcus Name Synonyms Methanococcus Kluyver and van Niel 1936 emend. Barker 1936 (Approved Lists 1980), nom. cons., emend. Mah and Kuhn 1984 Homonyms Methanococcus Methanococcus Kluyver and van Niel 1936 emend. Barker 1936 (Approved Lists 1980), nom. cons., emend. Mah and Kuhn 1984