Methanococcus vulcanius Dataset NCBI Taxonomy Classification phylum Euryarchaeota class Methanococci order Methanococcales family Methanocaldococcaceae genus Methanocaldococcus species Methanocaldococcus vulcanius Name Homonyms Methanococcus vulcanius Methanococcus vulcanius Jeanthon et al. 1999