Calanus hyperboreus is a copepod found in the Arctic and northern Atlantic. It occurs from the surface to depths of 5,000 metres (16,000 ft).

Members of the subclass Copepoda are gonochoric and sexually dimorphic. During copulation, male glues spermatophores to the female's venter. Life cycle: Eggs undergo six naupliar and five larval stages before becoming an adult.