Fig. 1. Serrasalmus maculatus spermiogenesis. A to C - Longitudinal sections of early spermatids during the nuclear rotation process. D and E - Longitudinal sections of early spermatids during the chromatin condensation process. F, G and J - Midpiece cross sections. H and I - Flagella in cross sections. Scale bars: A to C = 1 µm; D = 0.85 µm; E = 0.9 µm; F = 0.9 µm; G = 0.75 µm; H = 0.04 µm; I = 0.75 µm; J = 0.6 µm. A: axoneme; C: centriole complex; D: distal centriole; F: flagellum; M: mitochondria; N: nucleus; P: proximal centriole; V: vesicle; Asterisk: fins; Arrow: electron dense material; Arrowhead: cytoplasmic canal; Double arrow: nuclear fossa.

Published as part of Gusmão-Pompiani, Priscila, Malabarba, Luiz R., Oliveira, Claudio & Quagio-Grassiotto, Irani, 2009, Spermiogenesis and spermatozoa ultrastructure in the Serrasalminae (Ostariophysi: Characiformes) with further evidence on the relationships of the piranhas and pacus, pp. 385-394 in Neotropical Ichthyology 7 (3) on page 387, DOI: 10.1590/S1679-62252009000300005, http://zenodo.org/record/5420732