3. Results and discussion
3.1. Morphology
The male reproductive organs of the D. baccarum are comprised of paired testis, a pair of vas deferens, a pair of seminal vesicles,a complex bulbus and a ductus ejaculatorius, a pair of ectodermal sacs, and both mesodermal and ectodermal accessory glands(Fig. 1). The testes of the D. baccarum are elongate ovoid and red in color, usually located near the dorsum abdomen. The paired testes are connected to the seminal vesicles by the vas deferens(Fig. 1). The presence of tracheae in the testes and accessory glands were observed in the D. baccarum (Fig. 2a and b). The vas deferens
(through which the sperm travels) and the ‘seminal vesicle’ (where the sperms is stored prior to mating) are long and cylindrical, and of the same red color as the testis. Testes, vas deferens and the seminal vesicle in O. poecilus are long and orange (Santos et al., 2003).The seminal vesicle connects to the bulbus ejaculatorius which is balloon shaped and covered by irregularly shaped accessory glands.