Abstract
The 70 species of terebellomorph polychaetes of Iceland, north-east Greenland, Spitzbergen, the Barents Sea, the Norwegian Sea, Scandinavian waters, the North Sea, and the Baltic are grouped according to their distribution inside and outside the area under discussion. Their distribution is then used to characterize the different parts of the area. The number of species is small in the deep basins and moderate on the shelf, reaching a maximum in the coastal areas and thereafter decreasing in fjord and estuary systems. There is a more or less ubiquitous ‘arctic’ element in the fauna that dominates the deep sea and the shallow land-locked basins, whereas a ‘non-arctic’ element penetrates far north in coastal and fjord areas. When the fauna is compared with those of other areas, similarity is greater with the Arctic-Pacific then with the Atlantic at comparable distances.

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