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The belonging of the only one "gigantic cercaria", Cercaria splendens, to the species Azygia lucii was proved experimentally. The geographic distribution of A. lucii is considerably wider than it has been indicated up to now. The distribution area of A. robusta is also confined not only to the Asiatic part of the USSR. The following characters are suggested for distinguishing the Azygia species: the shape and size of the pharynx, the spread of vitellaria beyond the posterior border of the testes and ratio between the sizes of suckers.