Abstract
Based on the late Dr. Nils Knaben's notes, including a key to species, the present paper presents a revision of the pycnogonid genus Boreonymphon G. O. Sars, 1888. Four species are recognised, viz. the original B. robustum (Bell, 1855), B. abyssorum (Norman, 1873) which is re-established as a valid species, B. ossiansarsi Knaben sp. nov., and B. compactum Just sp. nov. Boreonymphon hians (Heller, 1875) is considered a synonym of B. robustum. Descriptions, drawings, and maps of distribution of all four species arc presented, together with a. revision of drawings and photos in the literature. The genus is considered truely high arctic.

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