Fig. 12

Spermiogenesis and synspermia of Galapa bella. TEM. A Early spermatid, cross-section. B Spermatozoa within synsperm. Note the shape of the peN and the position of the nuclear canal. C Anterior portion of a sperm cell within synsperm. Note the slightly conical shape of the AV and the membranous vesicles in the cytoplasm (arrow). D Synsperm within the deferent duct in cross-section. The thin secretion sheath becomes apparent as well as the tile-like seminal secretions. E 3D surface reconstruction of an individual sperm cell from the synsperm, illustrating further structural details as well as the course of the axoneme in a coiled state. F,G 3D surface reconstruction of the synsperm. For the purpose of clarity, only one axoneme is shown