Fig. 2. Cyphocharax modestus spermatozoa. a in Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes

Fig. 2. Cyphocharax modestus spermatozoa. a: spermatozoon longitudinal section, X 13000; b - g: midpiece cross sections; b, X 18000; c, X19300; d – f, X 22000; g, X 33700; h: midpiece longitudinal section, X 21000; i: centriolar complex, X 40000; j – l: flagella cross sections; j and k, X 80000; l, X 69000; m and n: flagella longitudinal sections; m, X 23000; n, X 31500. A: axoneme; B: basal body; C: centriolar complex; D: peripheral microtubular doublets; F: flagellum; HE: head; M: mitochondria; MC: membranous compartment; MP: midpiece; N: nucleus; P: single central pair of microtubules; PC: proximal centriole; V: vesicle; arrow: dinein arm; arrowhead: cytoplasmic channel; double arrowhead: nuclear fossa.