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75 results for “Gymnotus”
Fig. 4 in Kidney anatomy, histology and histometric traits associated to renosomatic index in Gymnotus inaequilabiatus (Gymnotiformes: Gymnotidae)
Fig. 4. Histological cross-sections of the head and exocrine kidney demonstrating different granulomatous structures in Gymnotus inaequilabiatus. a. severe aggregation of MMCs outer to granuloma in the exocrine kidney; PAS, bar scale = 20 µm. b. a clump of melanogenic macrophages (dark pigmented cells) adjacent to granuloma in the head kidney. The hematopoietic tissue is edematous and atypical. Some rodlet cells (black arrow) are observed. Granuloma presents a compact and thick layer of collagen with internal necrotic content surrounded by epithelioid cells (white arrows); H&E, bar scale = 10 µm. c. two well-defined granulomas with substantial internal necrotic content involved by fibrous tissue. A slight layer of MMCs aggregates close to the external wall of granuloma. TM, bar scale = 10 µm. d. MMCs aggregates both internally and externally to granuloma in the exocrine kidney. HE, bar scale = 10 µm.
Fig. 2 in Kidney anatomy, histology and histometric traits associated to renosomatic index in Gymnotus inaequilabiatus (Gymnotiformes: Gymnotidae)
Fig. 2. Cross-section of the head and exocrine kidney in Gymnotus inaequilabiatus. a. a transitional area between head (HE) and exocrine kidney (EX) drained by postcardinal vein (PCV). Lymphohematopoietic tissue is abundant in the head portion. MMCs are diffusely distributed in both portions. A thick fibrous capsule covers the organ (white arrow); HE, bar scale = 500 µm. b. the general aspect of the head kidney. Vascular sinusoids (white arrows) surrounding the lymphohematopoietic tissue enclosing the MMCs (black arrow); HE, bar scale = 200 µm. c. interstitial lymphohematopoietic tissue with MMCs deposits characterizes the exocrine kidney, in addition, the contoured tubules; renal corpuscle (white arrow); HE, bar scale = 200 µm. d. the exocrine kidney with a proximal convoluted tubule showing hyaline degeneration of the tubular epithelium often found in this species; HE, bar scale = 100 µm. e. exocrine kidney showing the corpuscle of Stannius (*). This structure is not lobulated, and is delimited by a fibrous capsule, and situated at the junction between head and exocrine portions; HE, bar scale = 500 µm. f. detail of junction between lymphohematopoietic tissue and corpuscle of Stannius in the head kidney. Fiber bundles subdivide both structures. Rodlet cells (white arrow), macrophages (M) and eosinophilic granulocytic cells (black arrow); granulocytic (G) and secretory cells (SC) internally fill the corpuscle; HE, bar scale = 50 µm.
Fig. 3 in Molecular assessment of Gymnotus spp. (Gymnotiformes: Gymnotidae) fishing used as live baitfish in the Tietê River, Brazil
Fig. 3. Agarose gel electrophoresis (3.0%) of NlaIII restriction fragments obtained from COI partial PCR amplification. Gymnotus cf. sylvius (1T13, 1T24, 1T20, 1T36, 2T29) and G. cf. cuia (2T13, 2T32 and 2T24). M- 100 bp molecular weight marker (Sinapse Inc). Numbers at fragments indicate estimated molecular weight.
Fig. 2 in Molecular assessment of Gymnotus spp. (Gymnotiformes: Gymnotidae) fishing used as live baitfish in the Tietê River, Brazil
Fig. 2. Neighbor-joining dendrogram of the COI partial sequences of Gymnotus spp. (1T13, 2T29, 1T14, 1T36, 2T26, 2T13, 2T32 and 2T24) collected in the Jacaré-Guaçu River, State of São Paulo, and obtained from GenBank, constructed from the distances of Kimura (K2P). The bootstrap values are indicated on the branches
FIGURE 5 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 5. Map of Colombia illustrating the type locality () of Gymnotus ardilai and 1: Bucaramanga city; 2: Pie de Cuesta; 3: Girón.
FIGURE 2. Gymnotus ardilai. Paratypes IAvHP 4001 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 2. Gymnotus ardilai. Paratypes IAvHP 4001, males, (A) 219.2 mm TL, (B) 329 mm TL. Lateral view.
Figure 1 in First record of Trichodina heterodentata (Ciliophora: Trichodinidae) in banded knifefish Gymnotus carapo (Gymnotidae) cultured in Brazil
Figure 1. Trichodina heterodentata collected from the gills of banded knifefish, Gymnotus carapo, farmed in Jataí, state of Goiás, Brazil. Stain: silver nitrate impregnation.
Fig. 3 in Evidence of the color pattern variation in populations of Gymnotus pantanal (Gymnotiformes) from three streams in the upper Paraná River basin, Brazil
Fig. 3. Color pattern variation in Gymnotus pantanal from Pinheirinho and Jacutinga streams. (a) 209.8 mm TL (NUP 9311); (b) 181.0 mm TL (NUP 9311); (c) 150.0 mm TL (NUP 9312); (d) 125.0 mm TL (NUP 9312).
Fig. 4 in Evidence of the color pattern variation in populations of Gymnotus pantanal (Gymnotiformes) from three streams in the upper Paraná River basin, Brazil
Fig. 4. Principal Component Analysis (PCA) ordination (a) and average values (± standard error) of the axes scores 1 (b) and 2 (c) from PCA ordination of morphometric characters for Gymnotus pantanal atypical color pattern (G. 1) and Gymnotus pantanal sensu stricto (G. 2).
Fig. 7 in A new vision of the origin and the oocyte development in the ostariophysi applied to Gymnotus sylvius (Teleostei, Gymnotiformes)
Fig. 7. Schema comparing oocyte development in a saltwater perciform, Sciaenops ocellatus and in a freshwater gymnotiform, Gymnotus sylvius.
Fig. 1 in A new vision of the origin and the oocyte development in the ostariophysi applied to Gymnotus sylvius (Teleostei, Gymnotiformes)
Fig. 1. Folliculogenesis in Gymnotus sylvius. Light Microscopy. A: Scattered in the germinal epithelium, the quiescent oogonium (g) is wrapped by the epithelial cells (arrow). Ovarian lumen: ol; Primary growth oocyte: po. B: Oogonia (g) proliferate and are surrounded by cells derived from the epithelium, the prefollicle cells (pf). Epithelium: arrow; Ovarian lumen: ol; Primary growth oocyte: po. C: Proliferation of the oogonium give rise to cell clusters, the germ cell nests (n), upon the magenta, PAS-positive basement membrane (bm) which in cross section is seen surrounding the nest. Epithelium: arrow; Ovarian lumen: ol; Secondary growth oocyte: so. D, E: In the nests (n), with the beginning and progress of meiosis, the prophase oocytes differentiate. In leptotene (lo) and in pachytene (po), they can be distinguished by the pattern of chromatin condensation. Proliferating oogonia (g) and prophase oocytes co-occur in a same nest (n). Epithelium: arrow; Ovarian lumen: ol. F, G: Prefollicle cells increasingly surround the oocytes, separating them one from another. As basement membranes form around individual oocytes and the prefollicle cells surrounding them, they are separated from the cell cluster. Completely surrounded by and individualized by
FIGURE 4 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 4. Lateral view of immature G. ardilai, 34 mm TL.
FIGURE 1. Gymnotus ardilai. Holotype IAvHP 3477 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 1. Gymnotus ardilai. Holotype IAvHP 3477 (CAR 05), female, 430 mm TL. Lateral view.
FIGURE 3 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 3. Head profiles of Gymnotus ardilai. (A) Holotype, (B) Paratypes.
Supplementary material 1 from: Scacchetti P, Pansonato-Alves J, Utsunomia R, Oliveira C, Foresti F (2011) Karyotypic diversity in four species of the genus Gymnotus Linnaeus, 1758 (Teleostei, Gymnotiformes, Gymnotidae): physical mapping of ribosomal genes and telomeric sequences. Comparative Cytogenetics 5(3): 223-235. https://doi.org/10.3897/compcytogen.v5i3.1375
Nexus file of aligned COI and COII nucleotide sequences.
Fig. 2 in Evidence of the color pattern variation in populations of Gymnotus pantanal (Gymnotiformes) from three streams in the upper Paraná River basin, Brazil
Fig. 2. Gymnotus pantanal, holotype, 196.0 mm TL, MZUSP 67874.
FIGURE 5 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 5. Map of Colombia illustrating the type locality () of Gymnotus ardilai and 1: Bucaramanga city; 2: Pie de Cuesta; 3: Girón.
FIGURE 2. Gymnotus ardilai. Paratypes IAvHP 4001 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 2. Gymnotus ardilai. Paratypes IAvHP 4001, males, (A) 219.2 mm TL, (B) 329 mm TL. Lateral view.
FIGURE 6 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 6. Comparison between linear regressions of caudal filament length versus total length (TL) for Gymnotus pantherinus and G. refugio.
FIGURE 7 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 7. Comparison between linear regressions of gape width versus head length (HL) for Gymnotus pantherinus and G. refugio.
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