Methanococcus vannielii Stadtman and Barker 1951 Dataset NCBI Taxonomy Classification phylum Euryarchaeota class Methanococci order Methanococcales family Methanococcaceae genus Methanococcus species Methanococcus vannielii Name Homonyms Methanococcus vannielii Methanococcus vannielii Stadtman and Barker 1951