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Pelophila borealis (Paykull). This pelophiline is one of the 97 species-group taxa which are Holarctic and found naturally in both the Palaearctic and Nearctic Regions. Most of these species are confined to the arctic, subarctic or boreal regions but a few are found mainly in the temperate regions such as Dyschirius politus. Most biogeographers agree that these species have spread between the two continents through Beringia during the Quaternary period.
