Methanococcus igneus Dataset NCBI Taxonomy Classification kingdom Methanobacteriati phylum Methanobacteriota class Methanococci order Methanococcales family Methanocaldococcaceae genus Methanotorris species Methanotorris igneus Name Homonyms Methanococcus igneus Methanococcus igneus Burggraf et al. 1990