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Bolbosoma nipponicum collected from Callorhinus ursinus (Linnaeus) (Carnivora: Otariidae) in St. Paul Island, Alaska. A: female; B: hooks; C: proboscis; D: male; E: trunk spines; F: testes and cement-glands; G: poster part of female. Scale bars: A, D = 1000 μm; B = 100 μm; C = 200 μm; E = 50 μm; F, G = 500 μm.
