Methanothermococcus Dataset NCBI Taxonomy Rank GENUS Classification phylum Euryarchaeota class Methanococci order Methanococcales family Methanococcaceae genus Methanothermococcus Name Synonyms Methanothermococcus Whitman 2002 Homonyms Methanothermococcus Methanothermococcus Whitman 2002