Palaeococcus helgesonii Amend et al., 2006 Dataset Catalogue of Life Rank SPECIES Classification kingdom Archaea phylum Euryarchaeota class Thermococci order Thermococcales family Thermococcaceae genus Palaeococcus species Palaeococcus helgesonii Name Homonyms Palaeococcus helgesonii Amend et al., 2006