Descrição ultra-estrutural da espermatogênese com ênfase na espermiogênese em Trypoxylon (Trypargilum) lactitarse (Hymenoptera: Sphecidae)

• Autor(a) principal: Gonçalves, Max Pereira
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2381
• topic: Espermatozóide; Morfologia; Espermatogênese; Spermatozoa; Morphology; Spermatogenesis; CNPQ::CIENCIAS BIOLOGICAS::BIOLOGIA GERAL

The spermatogenic process happens in the testicles, which are in number of two. In the insects, the testicles are formed by follicles, varying the number among the species. In Trypoxylon (Trypargilum) lactitarse three follicles are observed in each testicle. It is in the testicular follicles that the spermatogonias originate the spermatozoa. The spermatozoa of the insects usually present, in the head's region, nucleus and acrosome and, in the flagellum, is region an axoneme, two mitochondrial derivvatives and two accessory bodies. In the spermatogenesis process big significant alterations are observed in the spermatids that differentiated in to spermatozoa. Its happens occurs whit gradual and continuous way, that includes nuclear alterations and formation of the acrosome, the mitochondrial derivatives and axoneme. These alterations transform to turn the spermato zoa into a compact cell, with motility and fecundation capacity. The spermatogenic process in Trypoxylon (Trypargilum) lactitarse is similar to the observed for other Hymenoptera, however, two types of spermatozoa are formed, one with short nucleus and larger diameter and another with long and thin nucleus. Thus, this study ains: describe the structure and ultrastructure of the spermatogenesis in Trypoxylon (Trypargilum) lactitarse, and observe if the spermatogenic process is the same for both sperm types. Differences were not observed in the spermatogenic process between the two types of spermatozoa, being the process similar to the described for most of the insects.