ANATOMIA APIS MELLIFERA PDF

Nera Abdalla I ; Warwick E. The male reproductive apparatus MRA of insects is constituted by a pair of testes connected to aedeagus through the genital ducts. There was also an increase in distance between the testes and the rest of the internal organs due to the elongation of the post-vesicular deferent ducts, increased production of accessory gland secretion, and a spermatozoa releasing closer to the ejaculatory ducts. Type IV anatlmia present exclusively in the tribe Meliponini, and is characterized by the absence of accessory glands. Excluding the meliponines, and considering Type I as the ground plan of MRA, the first major modification of the MRA was the increased development of the accessory gland, which can already be observed in some representatives with Type I. The seminiferous tubules are separated from one another by interstitial tissue; and individually encapsulated by a peritoneal membrane.

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Nera Abdalla I ; Warwick E. The male reproductive apparatus MRA of insects is constituted by a pair of testes connected to aedeagus through the genital ducts. There was also an increase in distance between the testes and the rest of the internal organs due to the elongation of the post-vesicular deferent ducts, increased production of accessory gland secretion, and a spermatozoa releasing closer to the ejaculatory ducts. Type IV anatlmia present exclusively in the tribe Meliponini, and is characterized by the absence of accessory glands.

Excluding the meliponines, and considering Type I as the ground plan of MRA, the first major modification of the MRA was the increased development of the accessory gland, which can already be observed in some representatives with Type I. The seminiferous tubules are separated from one another by interstitial tissue; and individually encapsulated by a peritoneal membrane.

It is characterized by testes, seminal vesicles, and genital ducts totally or almost encapsulated by the scrotal membrane, and forming a globular unit Fig. The meliponines differ from the other bees by the loss of the accessory glands. Each contains one testis and one seminal vesicle Fig.

Therefore, in newly emerged adults, the testes are already undergoing degeneration, appearing as yellowish flat bodies Snodgrass Yet it is only around the 12 th day of adult life that a drone is mature for mating Anwtomiawhen all the spermatozoa is contained in the seminal vesicles and ready to be ejected in the female during mating Bishop The male sexual organs: Mate number, kin selection and social conflicts in stingless bees and honeybees.

In melliferra rest of their characteristics however, they share anatomical elements with Type I, such as those present melliferq Colletidae, which have very filiform anatomis glands with a very small dilation portion.

The testes are formed by a variable number of solid filaments, known as seminiferous tubules. Their histological structures and physiological functioning. Apparently the tendency of the male reproductive tract of bees was towards an increase in number and length of the seminiferous tubules, which must have resulted in an increased number of spermatozoa production.

A thicker ejaculatory duct allows a higher adhesion to the female during copulation, in addition, the secretion of the accessory glands increases even more the diameter of the ejaculatory duct at the moment of mating and might serve, as in Bombusas a plug that prevents the reflux of sperm or even improves the viability of the sperm posterior to mating BishopSnodgrass The similarity of the MRA of meliponines to that of the basal solitary bees is not the only similarity between these two groups of bees.

After this period, the number of protein bands in electrophoretic gels reduce, when at eight days old drones is present only three dominant polypeptides. The post-vesicular deferent ducts are joined and open directly at the ejaculatory duct, which is short and simple Fig.

Meliponines are also similar to solitary bees in the sense that they mass provision their brood cells before oviposition and then immediately seal the alveoli Zucchi et al. Comparative anatomy of the male reproductive internal organs of 51 species of bees. In the Megachilidae there are three seminiferous tubules per testis Fig. It is characterized by a very high number of seminiferous tubules, about per testis Louveaux Therefore, there appears to be a selective pressure towards and increased production of spermatozoa by the melliifera males, thus showing a larger size of the testes.

The rarity of multiple mating by females in the social Hymenoptera. The species were identified by Prof. The internal genital organs of males of 51 bee species, belonging to six families, were studied Table 1. In this species, as in most insects, spermatogenesis occurs during the pupal stage, and the testes display their maximum development between mellifera 5 th and the 6 th day of pupation Bishop The accessory gland loops can be developed Fig.

The second modification was an increase in the number of seminiferous tubules per testis, or their widening, as well as an elongation of the post-vesicular deferent ducts. It is characterized by the absence of the accessory glands and by seminal vesicles that is much thicker than the deferent ducts Fig. Melliferz remaining internal organs of the MRA, except for the ejaculatory duct and the accessory glands, also form a globular unit encapsulated by the scrotal membrane, which may be elongated Fig.

Literature Cited Alcock, J. In the Megachilidae and Melittidae, these ducts may open at the same site as seen in the Apidae Figs. Type Anafomia was only found in the Apidae studied and is characterized by separately encapsulated testes and genital ducts except for the post-vesicular deferent duct.

In all species, two portions compose the accessory gland: How to cite this article. Related Posts

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Mikakazahn This condition may be related and compensated by the continued spermatogenesis that extends into the adult life stage. It is characterized by testes, seminal vesicles, and genital ducts totally or almost encapsulated by the scrotal membrane, and forming a globular unit Fig. Literature Cited Alcock, J. It is characterized by mellifera absence of the accessory glands and apsi seminal vesicles that is much thicker than the deferent ducts Fig. The male reproductive apparatus of most insects possesses accessory glands, the mesadenial apix ectadenial glands, which open at the deferent ducts or at the ejaculatory duct, respectively SnodgrassChapman The type I is present in males of the less derived families Colletidae, Andrenidae, and Halictidae and is characterized by three seminiferous tubules per testis, which are almost completely enveloped by the scrotal membrane. In the Type III, the seminal vesicles are easily distinguishable from the deferent ducts by being longer and thicker and because they are folded inside the scrotal membrane, forming a globular unit Fig.

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Anatomie und Morphologie der Honigbienen – Apis mellifera

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