Palaeococcus helgesonii Amend et al. 2006 Dataset NCBI Taxonomy Classification phylum Euryarchaeota class Thermococci order Thermococcales family Thermococcaceae genus Palaeococcus species Palaeococcus helgesonii Name Homonyms Palaeococcus helgesonii Palaeococcus helgesonii Amend et al. 2006