Genetics redraws pelagic biogeography of .

Planktonic copepods of the genus play a central role in North Atlantic/Arctic marine food webs. Here, using molecular markers, we redrew the distributional ranges of species inhabiting the North Atlantic and Arctic Oceans and revealed much wider and more broadly overlapping distributions than previously described. The Arctic shelf species, , dominated the zooplankton assemblage of many Norwegian fjords, where only has been reported previously.