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1
A western European land snail that retains an operculum like its marine relatives, making it one of the very few terrestrial prosobranch gastropods found in Europe.
2
Native to Japan, the Japanese Trapdoor Snail is a large freshwater mollusk notable for its operculum, which acts as a protective door against predators.
3
The Faucet Snail is a small freshwater mollusk native to Europe that acts as an intermediate host for parasitic trematodes and is invasive in North America.
4
The Valve Snail is a freshwater gastropod native to Europe and Asia, distinguished by its circular operculum that perfectly seals its shell opening.
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