Fig. 33

Spermiogenesis and cleistospermia of Ciboneya antraia. TEM. A Early to mid spermatid. Note the nuclear pores. B Late spermatid. Note the hook-like extension of the peN (arrow). C Coiled spermatids and early cleistospermia in the lumen of the distal part of the testis. D Cleistosperm with fully developed secretion sheath. E Cleistosperm, cross-section. The small streaks of electron dense centriolar adjunct material are visible around the anterior part of the axoneme