Figure 11 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees

Figure 11 Chaetodactylus osmiaemale. TEM. (A) Advanced spermatocyte separated with stroma cell (SC) from neighboring spermatocytes. It shows a spongy layer (SpL) and empty spaces in peripheral cytoplasm in which many mitochondrial derivatives (md) are present. Nuage material (asterisks) surrounds the nucleus (n) containing a small, compact nucleolus (nu). (B) Spermatid in an early stage of spermiogenesis embedded in stroma cell (SC). The nucleus is no longer visible and chromatin (Ch) forms fine threads surrounded by foci of electron-dense material (white arrows). Mitochondrial derivatives are multiform, either large with meandering cristae (md) or small and vesicular (black arrow). (C