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The parasitic larva of certain freshwater mussels of the family Unionidae,having hooks for attaching to the gills or other external parts of a host fish. 瓣鉤幼蟲珠蚌科淡水貝類的寄生幼躰，長有鉤竝用來附著在寄宿主魚的鰓或其他躰外部分。