Dicranotaenia synsacculata Macko, 1988 [Cestoda, Hymenolepididae] - tasiemiec gagola Bucephala clangula [Linneus, 1758] notowany po raz pierwszy w Polsce
First record of species Dicranotaenia synsacculata Macko, 1988 [Cestoda, Hymenolepididae] of the goldeneye Bucephala clangula [Linneus, 1758] in Poland