Abstract
Three new species of internal trematodes, Plagioporus serratus sp. nov., Phyllodistomum lysteri sp. nov., and Parastiotrema ottawanensis gen. et sp. nov., are described from Canadian freshwater fish. Plagioporus serotinus Stafford, 1904, is redescribed, and the genus Caudotestis Yamaguti, 1934, is reduced to synonymity with Plagioporus Stafford, 1904. Anallocreadium pearsei Hunter and Bangham, 1932, is considered synonymous with A. armatum McCallum, 1895. The genus Bunoderina Miller, 1936, is reduced to synonymity with Bunodera Railliet, 1896.

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