Fig. 3. A in Sperm ultrastructure in three different families of weakly electric fishes (Teleostei: Gymnotiformes)

Fig. 3. A: Spermatozoon of Eigenmannia trilineata (SEM), h = sperm head, arrow = flagellum, double arrow = midpiece, m = mitochondrion; B, E: Spermatozoa of E. trilineata in longitudinal section (TEM) showing ovoid nucleus (n) with flocculent chromatin, centriolar arrangement (dc= distal centriole, pc= proximal centriole), and elongate mitochondria (m), v = vesicles; C: Flagella of spermatozoa of E. trilineata in cross sections (TEM) showing axonemal or flagellar fins (af); D: Midpiece of spermatozoa of E. trilineata in cross section (TEM) showing presence of vesicles (v) and mitochondria (m), and flagellar axoneme (a) with electron-lucent tubules of each peripheral doublet. Scale bars = 1µm.