Freshwater snail with a deep-brown flattened, coiled shell; it feeds on plants and is commonly found in still water habitats, where it occasionally swims to the surface for breathing purposes.
Great ramshorn
![](https://www.risorgivedibressanvido.it/wp-content/uploads/2020/08/Planorbarius-corneus-3-Grote-posthoornslak-Saxifraga-Kees-Marijnissen.jpg)
Freshwater snail with a deep-brown flattened, coiled shell; it feeds on plants and is commonly found in still water habitats, where it occasionally swims to the surface for breathing purposes.