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The discovery of Schistosomatium douthitti (Cort, 1914) Price, 1931, in a red-backed vole, Clethrionomys rutilus (Pallas), in Alaska extends the known distribution of the parasite in North America into the western subarctic and expands the list of known natural definitive hosts to five.
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L.G. Swartz (1966) studied this question.
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