Trichodinids are well-known protozoa associated with invertebrates as well as freshwater and marine fish. Trichodina sp. (Ciliophora: Peritricha) was found associated with the limpet species known as Patella sp. along the coast of Antalya Bay. Limpet gills were studied on scanning electron microscope and morphology of the protist was studied in detail. The existence of this protist was considered as an indication of organic pollution in sea water in the area.