Figure 12. Female reproductive anatomy of Pomacea maculata. Histology of pallial glandular oviduct. A, close-up of seminal receptacle and visceral oviduct. B, copulatory bursa with mass of unorientated sperm in centre of lumen. U-shaped channel separating bidirectional transit of sperm into seminal receptacle from bursa, and of eggs from seminal receptacle into albumen gland. C, section through concave albumen gland embedded within parenchymal tissue, showing the ciliated oviducal groove at periphery of the gland. D, close-up showing the ducts (arrows) leading from parenchymal tissue into the albumen gland. E, section through the capsule gland embedded within parenchymal tissue, showing the ventral channel and the ciliated oviducal groove. Inset in (E) shows a close-up of the ventral channel. Abbreviations: agl, albumen gland; bc, copulatory bursa; cgl, capsule gland; og, ciliated oviducal groove; ov, visceral oviduct; pa, parenchymal tissue; rcs, seminal receptacle; u, U-shaped channel; vc, ventral channel. Scale bars: 250 Mm (A–C, E); 100 Mm (D, E inset).