Fig. 5.

Region of genital openings and muscles encircling the dorsal blood vessel (arrowhead) (LM). a Transverse section of female immediately posterior to the dorsal furrow showing the opening of a single oviduct (arrow). b Transverse section of a male at the end of the ciliated grooves showing the genital papillae and the openings of the sperm ducts. Abbreviations: cc = coelomic cavity; cf = ciliated field; cg = ciliated groove; ep = epidermis; gp = genital papilla; ms = mesenchyme; py = pyriform gland; sd = sperm duct; vv = ventral blood vessel