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Stylommatophora is a "clade" of eupulmonate mollusk families that includes most of the terrestrial snails and slugs. All members of this group have a long pedal gland which produces protective and friction reducing mucus for locomotion, and two pairs of retractile tentacles on their head. The upper pair of tentacles house stalked eyes at the tip, olfactory organs are located on the lower pair (Kozloff 1990; Bouchet et al. 2005).