Methanococcus infernus Dataset NCBI Taxonomy Classification kingdom Methanobacteriati phylum Methanobacteriota class Methanococci order Methanococcales family Methanocaldococcaceae genus Methanocaldococcus species Methanocaldococcus infernus Name Homonyms Methanococcus infernus Methanococcus infernus Jeanthon et al. 1998