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