UNUSUAL SYNCYTIAL STRUCTURE OF THE GERM-CELLS IN THE CYPRINODONTIDAE APHYOSEMION-CAMERONENSE (PISCES, TELEOSTEI)

In the Cyprinodontidae Appyosemion cameronense, the development of the germ cells is marked by the lack of cytokinesis during the successive divisions of the spermatocytogenesis. As a result, numerous nuclei is sued from one another share a same cytoplasmic mass and a syncytial st ructure organization. Numerous vesicles form in the cytoplasm of each syncytium. The fragmentation of the syncytia occurs only at the sperma tocyte and spermatid stages. This fragmentation results from the coale scence of the vesicles. A flagellum surrounded by an intracytoplasmic canal is observed in certain syncytia.