Wild Wonders of Europe / Lundgren / European white waterlily (Nymphaea alba) with Great ram's horn snail (Planorbarius corneus) Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Great ram's horn snail (Planorbarius corneus) Danube Delta, Romania, June.

Wild Wonders of Europe / Lundgren / Empty Great ram's horn snail (Planorbarius corneus) shells laying on riverbed of a small tributary to Danube Delta, Romania, June.

Juan Carlos Munoz / Fossil of freshwater snail (Planorbis sp) from the Miocene period, Albacete, Spain

Willem Kolvoort / Ramshorn snail (Planorbis planorbis) in garden pond, Holland

Willem Kolvoort / Great pond snail (Lymnaea stagnalis) and two Great ramshorn snails (Planorbis corneus) under leaf of White water lily (Nymphaea alba) garden pond, Holland

Willem Kolvoort / Great ramshorn snail (Planorbis corneus) sand winning pit, Holland

Willem Kolvoort / Ramshorn snail (Planorbis planorbis) and Chinamark moth larva (Nymphula nympheata) underwater on the leaf of the White water lily (Nymphaea alba) in garden pond, Holland

Willem Kolvoort / Great ramshorn snail (Planorbis corneus) sand winning pit, Holland. This snail does not have enough pigment in its skin, the red colour is caused by haemaglobin.

Willem Kolvoort / Great ramshorn snail (Planorbis corneus) feeding on alage on growing leaf of Yellow water lily, Lake Naarden, Holland

Willem Kolvoort / Ramshorn snail (Planorbis planorbis} feeding on algae on leaf, Lake Naarden, Holland

Willem Kolvoort / Great ramshorn snail (Planorbis corneus) feeding on alage on leaf, Lake Naarden, Holland