Integrative taxonomy of the genus Onchidium Buchannan, 1800 (Mollusca, Gastropoda, Pulmonata, Onchidiidae)

Male, anterior, copulatory parts, O. typhae. A Penial hooks, Malaysia, Matang, scale bar 30 µm (USMMC 00005, #1) B Flat disc at distal end of flagellum of penial accessory gland, Malaysia, Langkawi Island, scale bar 100 µm (USMMC 00002, #1) C Tip of hollow spine, penial accessory gland, Singapore, scale bar 4 µm (ZRC.MOL.6397, #1) D Detail of B, scale bar 20 µm (USMMC 00002, #1) E Hollow spine, penial accessory gland, Singapore, scale bar 100 µm (ZRC.MOL.6397, #1) F Hollow spine, penial accessory gland, Malaysia, Langkawi Island, scale bar 100 µm (USMMC 00002, #1).