Fig. 38

Spermiogenesis and cleistospermia of Modisimus elongatus. TEM. A Early spermatids, showing a heterogenous condensation pattern. B Late spermatid, cross-section. The centriolar adjunct material begins to develop at this stage, as visible by the peculiar electron-dense material surrounding the axoneme. C Cleistosperm. Note the heterogenous cytoplasm with the prominent aggregation of mitochondria. D Cleistosperm. The centriolar adjunct material is visible as well as the position of the nuclear canal in a projection along the peN