Specimens previously identified as Fimbriaria fasciolaris or Fimbriaria sp. from Poland, Ukraine and the Czech Republic were re-examined. The revision revealed Fimbriaria czaplinskii from naturally-infected Anas platyrhynchos dom., Anas acuta and Aythya fuligula (new host records) in Poland, Tadorna tadorna from the Black Sea coast and Aythya ferina from the coast of the Sea of Azov, Ukraine (new host records), Anas platyrhynchos, Aythya fuligula and Aythya ferina (the latter two being new host records) from Moravia, Czech Republic (new geographical record). The diagnostic characters of F. czaplinskii are commented and updated from an original erroneous description. The most reliable distinguishing character is the structure of the copulatory part of the vagina, which is funnel-shaped and usually has smooth internal surface. The characters associated with the cirrus size and armament and the number of genital primordia per segment are not considered reliable differentiating characters. A lectotype and paralectotypes of F. czaplinskii are designated.
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