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The male reproductive system of Eurydema ventrale Kolenati 1846 is studied morphologically and histologically by using light, scanning and transmission electron microscopes. The reproductive system of the male E.ventrale consists of a pair of testis, a pair of vas deferens, a pair of seminal vesicles, accessory glands, a bulbus ejaculatorius, a pair of ectodermal sacs, and a ductus ejaculatorius. The testicular follicles have three different development zones (growth zone, maturation zone, and differentiation zone). The testes are connected to the seminal vesicles by the vas deferens that is a specialized in sperm storage. Sperm have an elongated head and a tail (flagellum) with an axonema and two mitochondrial derivatives. Vas deferens and seminal vesicles are fine, long, and cylindrical. The seminal vesicle is connected with bulbus ejaculatorius, which is balloon shaped and surrounded with accessory glands. The bulbus ejaculatorius is continuous with ductus ejaculatorius which is connected to the aedeagus.

This paper reveals the morphology and histology of the adult male reproductive system in the stink bug, Apodiphus amygdali (Germar, 1817), using light and scanning electron microscopy. Males have a pair of testes situated laterally to the alimentary canal, a pair of elongated cylindrical vasa deferentia and seminal vesicles, which join in a complex bulbus ejaculatorius, a ductus ejaculatorius, a pair of ectodermal sacs, a pair of accessory glands, and the phallus. Each testis consists of seven testicular follicles connected to the vas deferens. Each follicle contains a germarium, followed apically by growth zones where spermatozoa differentiate in the direction of the vasa deferentia. Each testis is connected to the seminal vesicle by a vas deferens. The seminal vesicles are connected to the bulbus ejaculatorius, which is surrounded by the tubularly coiled accessory glands. The bulbus ejaculatorius is continuous with the ductus ejaculatorius and connects to the aedeagus demonstrating its ectodermic origin.

The morphology and ultrastructure of the Malpighian tubules of Dolycoris baccarum were analyzed by scanning (SEM) and transmission (TEM) electron microscopy in order to determine their functional organization. The Malpighian tubules are compared with similar structures of other insects based on cell structure and functional organization. The Malpighian tubules of D. baccarum extend from the midgut-hindgut region of the digestive tract. The Malpighian tubules are divided into two regions: the proximal segment is short and flattened and the distal segment is long, stringy in shape and free in hemolymph. The tubules are generally long and narrow. There is a large number of trachea around the tubules. They consist of a single layer of epithelial cells. It is observed in the TEM observation that the epithelial cells have numerous microvilli at the apical side of the cells. At the basal side of the cells, there is a great number of membrane foldings and mitochondria among them. Besides some spherites, mitochondria, lysosome-like bodies, and large or small granules can be distinguished in the cells. With this study, we aimed to demonstrate the ultrastructure of the Malpighian tubules of D. baccarum and differences or similarities with other species.

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