Hexagrammia is a genus of trematodes in the family Opecoelidae.
Species Hexagrammia longitestis Schell, 1973Schell, S. C. (1973). Three new species of digenetic trematodes from Puget Sound fishes. Proceedings of the Helminthological Society of Washington, 40, 227–230. Hexagrammia zhukovi Baeva, 1965
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