Marsh Marigold (Caltha Palustris) with a freshwater snail on it. This flower also called King Cup is spread mostly in temperate regions of the Northern Hemisphere. It loves the wet and shady places, being found in marshes, on the rivers banks.
The image was captured using a Canon Lumix DMC LS1 camera with these settings: exposure time – 1/400 sec, focal length – 5,8 mm, ISO – 64, lens aperture – F/2,8.