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53 results for “Gephyrocharax”
Fig. 1 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 1. Gephyrocharax torresi, (a) UIST 1767, holotype male, 36.7 mm SL, río Cascajales system, río La Colorada basin, río Magdalena system; (b) UIST 1766, paratype female, 42.0 mm SL, río Cascajales system, río La Colorada basin, río Magdalena system. Note externally developed urogenital papillae indicated by white arrow.
Fig. 3 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 3. Lateral view of lateral branched pectoral-fin ray of Gephyrocharax torresi, AI 293, paratype male, 34.7 mm SL, left side. Scale bar = 1 mm.
Fig. 5 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 5. Comparative regression plots of males (n = 18) and females (n = 19) of Gephyrocharax torresi. All variables as function of SL: (a) Caudal-peduncle depth (females: r2 = 0.95; males: r2= 0.94), (b) caudal-peduncle length (females: r2 = 0.87; males: r2= 0.73), (c) pectoral fin to pelvic fin length (females: r2 = 0.87; males: r2 = 0.74), (d) pelvic-fin length (females: r2 = 0.89; males: r2 = 0.94).
Fig. 4 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 4. Lateral view of caudal fin of Gephyrocharax torresi, AI 293, paratype male, 34.7 mm SL, left side, depicting: (a) pouch scale and associated caudal-fin squamation in ventral lobe; (b) caudal fin lower lobe rays and claw (scales removed). Scale bar = 1 mm.
Fig. 7 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 7. Gephyrocharax melanocheir, (a) CIUA 1060, male, 32.9 mm SL, Quebrada Casanguila, río Magdalena system; (b) AI 298, female, 35.4 mm, Quebrada Grande, río Magdalena system.
Fig. 2 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 2. Lateral view of jaws and dentition of Gephyrocharax torresi, UIST 1751, paratype female, 36.7 mm SL, right side. (a) Premaxilla and maxilla. (b) dentary, anguloarticular, and retroarticular bones.
Fig. 3 in On the origin and diversification of Venezuelan freshwater fishes: the genus Gephyrocharax (Ostariophysi: Characidae) a case study
Fig. 3. Scheme for the possible origin of the species of Gephyrocharax in Venezuela. Hypothesized changes in the course of the Orinoco River in Venezuela and how they may have influenced the formation of major watersheds within the country follow Rod (1981), Díaz de Gamero (1996), and Lundberg et al. (1998). Major river basins in Venezuela are depicted in Fig. 1. (*) indicates simpatry.
Fig. 2 in On the origin and diversification of Venezuelan freshwater fishes: the genus Gephyrocharax (Ostariophysi: Characidae) a case study
Fig. 2. Phylogenetic approach for the three species of Gephyrocharax in Venezuela. Corynopoma riisei is included as the external group (Names in bold denote major river basins referred to in the text).
Fig. 1. a in On the origin and diversification of Venezuelan freshwater fishes: the genus Gephyrocharax (Ostariophysi: Characidae) a case study
Fig. 1. a. Geographical distribution of species of Gephyrocharax. b. Sampling sites for Gephyrocharax and Corynopoma riisei in Venezuela. 1. La Pedregosa River, Machango River basin, Zulia State. 2. Meachiche River, Falcón State. 3. Aroa River, km 26, Palma Sola, Falcón State. 4. Las Peñas de Taría River, Yaracuy River basin, Yaracuy State. 5. Alpargatón River, Urama River basin, Carabobo State. 6. La Cumaca River, San Diego River basin, Carabobo State. 7. La Maleja creek, Guapo River basin, Miranda State. 8. Pao River, Orinoco River basin, Anzoátegui State. In sites 3 and 4 G. venezuelae and G. valencia occur sympatrically. Limits between major river basins (Lake Maracaibo, Caribe, Paria, and Orinoco) follow Mago-Leccia (1970) and are indicated with a solid line.
Fig. 6 in Gephyrocharax torresi (Characiformes: Characidae: Stevardiinae), a new species from the río Cascajales basin, río Magdalena system, Colombia
Fig. 6. Geographic distribution of Gephyrocharax torresi (black rhomboids).
FIGURE 32 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 32. Sheared principal components analysis of morphometric data of Gephyrocharax valencia comparing among species organized by geographic groups: (A) left plots showing first and second principal components (PC1 vs. PC2); (B) right plots showing second and third principal components (PC2 vs. PC3). Sheared principal component: H, principal component centered by groups: S. Percentage of explained variance beside each component.
FIGURE 31 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 31. Gephyrocharax valencia, (A–B) upper and lower jaws, female, 32.7 mm SL, ANSP 134924; (C–D) detail of lower caudal skeleton and associated pouch scale, male, 27.5 mm SL, MBUCV 3675. Anguloarticular: aa, dentary: dt, maxilla: mx, premaxilla: pm, pouch scale: ps, posteroventral lobe: pvl, principal caudal-fin ray: pcr, retroarticular: ra, spur-shaped structure: sss, ventral procurrent ray: vpr. Lateral view, left side. Scale = 1 mm.
FIGURE 33 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 33. Gephyrocharax venezuelae, (A) male, holotype, 32.0 mm SL, USNM 121369; (B) male, paratype, 30.0 mm SL, MCZ 37269; (C) female, paratype, 31.9 mm SL, MCZ 37269; (D) male, 31.1 mm SL, MBUCV 24258. Additional illustration in Bonilla-Rivero & López-Rojas (1997: fig. 2).
FIGURE 34 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 34. Gephyrocharax venezuelae, (A–B) upper and lower jaws, female, 39.5 mm SL, MBUCV 23840; (C–D) detail of lower caudal skeleton and associated pouch scale, male, 31.0 mm SL, MBUCV 24258. 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, left side. Scale = 1 mm.
FIGURE 30 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 30. Gephyrocharax valencia, (A) male, holotype, 27.5 mm SL, CAS 44297; (b) male paratype, 30.4 mm SL, CAS 44295; (C) female, 26.8 mm SL, MCZ 59390; (D) female, 26.0 mm SL, MCZ 59642; (E) female, INHS 31627, 30.5 mm SL. Photographed specimens representing some geographic groups analyzed using SPCA in text. Additional illustrations in Vanegas-Ríos & Phillip (2013: fig. 1) and Phillip et al. (2013: fig. 38).
FIGURE 29 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 29. Gephyrocharax torresi, (A–B) upper and lower jaws, female, paratype, 35.7 mm SL, UIST 1751, right side; (C– D) detail of lower caudal skeleton and associated pouch scale, male, 34.7 mm SL, MLP 10518, left side. Anguloarticular: aa, dentary: dt, maxilla: mx, premaxilla: pm, pouch scale: ps, posteroventral lobe: pvl, principal caudal-fin ray: pcr, retroarticular: ra, spur-shaped structure: sss, ventral procurrent ray: vpr. Lateral view. Scale = 1 mm.
FIGURE 28 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 28. Gephyrocharax torresi, (A) male, holotype, 36.7 mm SL, UIST 1767; (B) female, paratype, 42.6 mm SL, UIST 1766. White arrow indicates urogenital papillae. Figure modified from Vanegas-Ríos et al. (2013: fig. 1).
FIGURE 27 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 27. Regression plot by sex of pelvic-fin length as function of SL for Gephyrocharax sinuensis (females, r = 0.89, r2 = 0.80, ɑ = 0, β = 0.180, n = 31; males, r = 0.81, r2 = 0.65, ɑ = 0, β = 0.216, n = 23).
FIGURE 26 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 26. Gephyrocharax sinuensis, (A–B) upper and lower jaws, female, 35.9 mm SL, CAR 403; (C–D) detail of lower caudal skeleton and associated pouch scale, male, 35.1 mm SL, CAR 403. Anguloarticular: aa, dentary: dt, maxilla: mx, premaxilla: pm, pouch scale: ps, posteroventral lobe: pvl, principal caudal-fin ray: pcr, retroarticular: ra, spur-shaped structure: sss, ventral procurrent ray: vpr. Lateral view, left side. Scale = 1 mm.
FIGURE 25 in Taxonomic review of the Neotropical genus Gephyrocharax Eigenmann, 1912 (Characiformes, Characidae, Stevardiinae)
FIGURE 25. Gephyrocharax sinuensis, (A) male, neotype by present designation, 32.1 mm SL, ICNMHN 18999; (B) male, 34.0 mm SL, CAR 446; (C) female, 36.0 mm SL, CAR 403. White arrows indicate urogenital papillae and unbranched hypertrophied pelvic-fin ray.
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