Fig. 3 in Comparative analysis of spermiogenesis and sperm ultrastructure in Callichthyidae (Teleostei: Ostariophysi: Siluriformes)

Fig. 3. Spermatozoa of Corydoras flaveolus. a) Spermatozoon longitudinal section. b and c) Nucleus in transverse sections. d) Detail of centriolar arrangement. e to j) Midpiece longitudinal and transverse sections showing mitochondria, vesicles, cytoplasmic channel, and electron-dense circular structure. k and l) Flagellum longitudinal sections. m and n) Flagellum cross sections. (a) X 17000; (b, c) X 15750; (d) X 28350; (e, f, h) X 23000; (g, m) X 42000; (i) X 18900; (j) X 25200; (k) X 25300; (l, n) X 31500. B: basal body; D: distal centriole; E: electron-dense structure; F: flagellum; N: nucleus; P: proximal centriole; V: vesicles; Asterisk: mitochondria, Arrow: cytoplasmic channel; Arrowhead: lateral membranous compartment; Double arrowhead: electron-dense material between the centrioles; Lozenge: electron-dense circular structure.