Eight cestode species from the family Diphyllobothriidae Luehe, 1910 were found in three seal species, occurring near the Arctowski Station, the South Shetland Islands, West Antarctic. Diphyllobothrium wilsoni (Shipley, 1907), D. scotti Shipley, 1907, D. lashleyi (Leiper et Atkinson, 1914) and Glandicephalus perfoliatus (Railliet et Henry, 1912) occur in the Weddell seal; D. scoticum (Rennie et Reid, 1912), D. quadratum (Linstow, 1892), D. pseudowilsoni sp. n. and immature specimens of D. scotti in the leopard seal; Baylisia baylisi Markowski, 1952 in the crabeater seal. Diphyllobothrium pseudowilsoni sp. n. is distinguished from D. wilsoni (syn. D. mobile Rennie et Reid, 1912) by having more numerous testes, the absence of distinct armature of the cirrus, the arrangement of the vitelline follicles and from D. scotti in the shape of the scolex, the shorter body and neck, and the arrangement of the vitelline follicles. A key to all diphyllobothriid cestodes occurring in Antarctic seals is given.
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