The center of diversity for the family is the western Palearctic, especially the Iberian peninsula (Wiktor 1996).
About 35 species are in the genera Arion, Geomalacus, and Letourneuxia (Barker & Efford 2004).
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Appears under "Comprehensive Description"
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© Paustian, Megan
Terrestrial Slugs Web
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