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