Figure 9. Male reproductive morphology of Pomacea maculata. Histology of penis sheath: (A) apical gland; (B) basal gland; and (C) ventral basal gland. D, critical point-dried penial sheath showing two glands on the dorsal surface. Abbreviations: apsg, apical penis sheath gland; bpsg, basal penis sheath gland; ct, ctenidium; me, mantle edge; msc, medial sheath channel; pb, penis bulb; pp, penis pouch; ps, prostate; vbg, ventral basal gland; vgd, ventral gland duct. Scale bars: 250 Mm (A–C); 1 mm (D).