A family of small aquatic and semi-aquatic snails found primarily in freshwater systems of tropical regions.
From Greek 'helix' (spiral or coil) referring to the snail's shell shape, plus '-idae' (family name suffix used in biological classification).
These tiny snails have the most bizarre anatomy—some species have a trapdoor-like operculum that seals them completely shut, making them like little living submarines that can survive being out of water!
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