Methanococcus jannaschii Dataset NCBI Taxonomy Classification phylum Euryarchaeota class Methanococci order Methanococcales family Methanocaldococcaceae genus Methanocaldococcus species Methanocaldococcus jannaschii Name Homonyms Methanococcus jannaschii DSM 2661 Methanococcus jannaschii Methanococcus jannaschii Jones et al. 1984