FIGURE 13: Gamasodes spiniger, DIC (A), TEM (B, C). (A) Isolated spermatozoon with anterior end directed to the right. Arrow indicates posterior end of nucleus. (B) Deferent duct spermatozoon cross-sectioned through the nucleus filled with homogenous nuclear material (n) and surrounded by sIBs. More peripherally, 13 ribbons (rb) alternating with mitochondria (m) are present. Nucleus of deferent duct cell (dd) contains a prominent nucleolus (nu). (C) Deferent duct spermatozoa sectioned at postnuclear region, containing gIBs and mitochondria (m) surrounded by ribbons (rb); note only 12 ribbons in left sperm section; sperm cell sectioned more posteriorly (lower right corner) is filled with mitochondria (m), whereas gIBs are no longer present. Scale bars: 20 µm in (A); 1 µm in (B, C). Abbreviations: dd – deferent duct cell, gIB – granular inclusion body, m – mitochondrion, n – nucleus, nu – nucleolus in nucleus of deferent duct cell, rb – subplasmalemmal longitudinal ribbon, sIB – striated inclusion body