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