A genus of small spiral-shelled land snails that have a circular mouth opening, found mainly in temperate regions of Europe and Asia.
From Greek 'kyklos' (circle) + 'stoma' (mouth). The name describes the distinctive round aperture of the shell that gives these mollusks their characteristic appearance.
These snails were so common in Victorian times that they inspired their own scientific family name, becoming a standard example in early malacology textbooks—naturalists were fascinated by how perfectly round their shell openings were.
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