Zonitidae, common name the true glass snails, are a family of mostly rather small, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Zonitoidea.Zonitidae is the only family in the superfamily Zonitoidea. The family's type genus is Zonites, established by Pierre Denys de Montfort in 1810.These snails live in damp places under stones and similar objects. The true glass snails are usually nocturnal.The spiral, heliciform shells of these snails are flattened in shape with a very low spire. The shell is perforate or umbillicate. The lip of the aperture is simple, lacking thickened margin. These shells are more or less transparent as if made of glass, hence the popular name "glass snails". The shells are colorless or of an amber to brownish color.

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