FIGURE 7 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 7. Spermiogenesis in Gephyrocharax machadoi n. sp. A,B,C,D,E: Longitudinal sections. A: The nucleus (n) initially is spherical. B,C,D,E: The chromatin gradually starts compaction process. B,C: The nucleus is shifted to up to the centriolar complex, where proximal (p) and distal (d) centrioles are located, and later it elongates towards the flagellum (C–E). The proximal centriole is anterior and oblique in relation to the distal centriole. D,E: The mitochondria (m) and vesicles (v) are distributed through the midpiece (pi). Asterisk: cytoplasmic canal, f: flagellum, arrow: nuclear fossa. Bars: A,B,C,D,E: 1µm.