Abstract
D. spirocauda were found in the cardiovascular systems of 17 of 369 (4.6%) free-living ringed seals (Phoca hispida), 4 of 47 (8.5%) spotted seals (P. vitulina largha), 17 of 99 (17.2%) harbor seals (P. vitulina richardii), 1 of 19 (5.3%) ribbon seals (P. fasciata) and 2 of 51 (3.9%) bearded seals (Erignathus barbatus) collected from March, 1975 through Sept., 1979 in Alaskan waters. This is the 1st report of D. spirocauda in ribbon and bearded seals. Certain species of marine mammals from the families Ursidae, Otaridae, Odobenidae, Balaenidae, Phocaenidae and Monodontidae also were examined but none was infected.

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