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A new nematode species, Capillostrongyloides norvegica sp. n., is described from the stomach of the lotid marine fish Enchelyopus cimbrius (Linnaeus) (Lotidae, Gadiformes) from the coastal waters near Bergen, Norway. This is characterized mainly by its body size (body length of male and female 4.01-5.74 and 7.83-12.28 mm, respectively), number (32-41) and structure of the stichocytes, length of the spicule (0.273-0.366 mm), structure of the male caudal bursa (markedly large caudal membrane), structure and size of the eggs (size 0.063-0.075 × 0.027-0.033 mm), and by the presence of the conspicuously elevated anterior vulvar lip in females. This is the first Capillostrongyloides species reported from fishes in Europe. A key to Capillostrongyloides species is provided. Another capillariid, Capillaria gracilis (Bellingham, 1840), occurred in the rectum of E. cimbrius of the same locality (a new host record).