Abstract:Organotin compounds, especially tributyltin (TBT), are widely used as biocidal additives in antifouling paints because of their effectiveness. However, they also cause severe damages to non-target organisms while they kill fouling organisms. For example, TBT has been reported to induce imposex in gonochoristic gastropods, that is, imposition of male sexual organs such as penis and vas deferens on female sexual organs. In the present study, we describe anatomical and histological structures of imposex genita...