Fig. 33
From: Evolutionary morphology of sperm in pholcid spiders (Pholcidae, Synspermiata)
Spermiogenesis and cleistospermia of Ciboneya antraia. TEM. A Early to mid spermatid. Note the nuclear pores. BÂ Late spermatid. Note the hook-like extension of the peN (arrow). CÂ Coiled spermatids and early cleistospermia in the lumen of the distal part of the testis. DÂ Cleistosperm with fully developed secretion sheath. EÂ Cleistosperm, cross-section. The small streaks of electron dense centriolar adjunct material are visible around the anterior part of the axoneme