A New Polyclad Flatworm, Idiostylochus tortuosus gen. nov., sp. nov. (Platyhelminthes, Polycladida) from France. Can this Foreign Flatworm be Responsible for the Deterioration of Oyster and Mussel Farms? Zoological Studies, 62, May 26 2023: 1-14. 5 [Zoological Record Volume 159]