the root (no rank)
Archaea (domain)
Euryarchaeota (phylum)
Thermococcales (order)
Thermococcaceae (family)
Pyrococcus (genus)
[hide inferior taxa]
Pyrococcus abyssi (species)
Pyrococcus endeavori (species)
Pyrococcus furiosus (species)
Pyrococcus horikoshii (species)
Pyrococcus kodakaraensis (species)
Pyrococcus sp. (species)
Pyrococcus woesei (species)