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Arion vulgaris, subepidermal gland types in the lateral and ventral pedal integument. Detailed overview of the (a) five lateral gland types (A1l–A5l), the transitory gland type At, and (b) the four ventral gland types (A1v–A4v) and their secretory content. The lateral pedal epithelium (ep) is covered by microvilli (mv), while on the ventral side the epidermis cells have not only microvilli but also cilia (ci + mv) on their apical pole. Scale bars in a and b = 50 μm
