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FIGURE 8 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)

FIGURE 8. Gephyrocharax caucanus, (A–B) upper and lower jaws, female, 39.8 mm SL, IMCN 3084, right side; (C–D) detail of lower caudal skeleton and associated pouch scale, male, 32.3 mm SL, IMCN 2260, left side. Anguloarticular: aa, dentary: dt, maxilla: mx, premaxilla: pm, pouch scale: ps, posteroventral lobe: pvl, principal caudal-fin ray: pcr, retroarticular: ra, spurshaped structure: sss, ventral procurrent ray: vpr. Lateral view. Scale = 1 mm.

FIGURE 5 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)

FIGURE 5. Gephyrocharax atracaudatus, (A–B) upper and lower jaws, female, 43.5 mm SL, STRI 7228; (C–D) detail of lower caudal skeleton and associated pouch scale, male, 44.1 mm SL, STRI 7228. Anguloarticular: aa, dentary: dt, maxilla: mx, premaxilla: pm, pouch scale: ps, principal caudal-fin ray: pcr, retroarticular: ra, spur-shaped structure: sss, ventral procurrent ray: vpr. Lateral view, left side. Scale = 1 mm.

FIGURE 4 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)

FIGURE 4. Gephyrocharax atracaudatus, (A) female, holotype, 39.7 mm SL, FMNH 7573; (B) male, 37.7 mm SL, STRI 1178; (C) female, 38.2 mm SL, AMNH 37808. Additional illustration in Burns & Weitzman (2005: fig. 14).

FIGURE 3 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)

FIGURE 3. Geographic distribution of Gephyrocharax species occurring from eastern versant of Andean Cordillera across Lake Maracaibo and Orinoco basins to island of Trinidad in northeast South America. Map includes additional records reported by Bonilla-Rivero & López-Rojas (1997) and Bonilla-Rivero & López-Rojas (2001) for G. valencia (MBUCV 297, 3023, 3029, 3051, 35679, and 35682; Cúpira, Las Peñas de Taría, and Urama Rivers basin, not catalogued) and G. venezuelae (MBUCV 35685, 35686, and 35687).

FIGURE 5 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 5. Gephyrocharax machadoi sp. n., CPUFMT 1463, paratype, male 41.4 mm SL, caudal fin skeleton showing gap between second and third ventral procurrent rays. Note associated accessory scales.

FIGURE 4 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 4. Caudal-fin lobe of Gephyrocharax machadoi sp. n. showing squamation of ventral portion. A) Lateral view, left side of holotype, CPUFMT 2429, sexually active male, 37.6 mm SL. B) Lateral view, left side of paratype, CPUFMT 2428, sexually active female, 39.3 mm SL.

FIGURE 1 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 1. Gephyrocharax machadoi sp. n., A) male, holotype, CPUFMT 2429, 37.6 mm SL; B) female, paratype, CPUFMT 2428, 38.1 mm SL.

FIGURE 8 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 8. Spermatozoon of Gephyrocharax machadoi. A,B,C,F: Longitudinal sections. D,E,G,H,I,J,K,L: Cross sections. A,B: Granular chromatin is present in the nucleus (n), which is drop-shaped and elongated towards the flagellum (f). The midpiece contains elongated mitochondria (m) and vesicles (v). C,D,E: The nucleus has two lobes that involve the initial portion of the flagellum (f). F: The double nuclear fossa (arrow) partially houses proximal centriole (p) which is anterior and forms an acute angle in relation to the distal centriole (d). G,H,I,J,K: Section of anterior portion of nucleus (n) that displays mitochondria (m). Inside letter I is the axoneme with classical pattern of microtubules (9+2). L: Note the presence of the cytoplasmic sleeve (arrowhead). Asterisk: cytoplasmic canal. Bars: A,B,C,D,E,F: 1 µm. G,H,I,J,K,L: 0.6 µm.

FIGURE 3 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 3. Map of South America showing the type locality (star) of Gephyrocharax machadoi sp. n. Black circle represents other collection sites.

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.

FIGURE 6 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 6. Light micrographs through mature ovaries of Gephyrocharax machadoi sp. n., CPUFMT 2387, 34.9 mm SL, arrow indicates spermatozoa.

FIGURE 2 in Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

FIGURE 2. Gephyrocharax machadoi sp. n., CPUFMT 1463, paratype, 41.4 mm SL. Upper and lower jaws, left side, lateral view.